KHS stencils were daunting to identify at first, but eventually their characteristics became clear, from various trim pieces to valve casings to pistons [of a distinctive type] and bell engraving. Unfortunately, a comprehensive step-by-step guide is not here, but I have many different pieces that would eventually make such a guide.

Now that Amati catalogs have been acquired, the next step is KHS and any PRC firms possible. If this random Red-Chinese catalog exists at https://yorkmaster.org/yorkmaster/photos/635599975-1995-Skylark-catalogue-brass-pages/index.html - there has to be more...

https://www.khsmusic.com/en/brand_page/4 states:
1956: K.H.S. built its first factory in Luzhou, Taipei. This factory produced harmonicas under the Swallow and Butterfly brands.
1957: K.H.S. began to manufacture wind instruments under the Swallow brand. The first mass produced wind instruments were trumpets and trombones.
1977: K.H.S. started to mass produce flutes and saxophones. Note: https://www.saxontheweb.net/threads/super-swallow-asian-tenor-yts-61-fake.221219/ would be such a saxophone, and Altus/Spencer M Eudy "SMUD" flutes and woodwinds resulted - Kurt Heisig claims the initial sax designs were from Ralph Morgan, sent to Korea [Samick or an affiliate?] and wound up in Taiwan. Albert Cooper and William Bennett were apparently influential in designing their flutes, later associated with Altus/Tanaka, whose work was "a Christmas gift to KHS"... Powell/Sol Ostroff also appear in the list of design contributors...
1980: Swallow was renamed Jupiter. K.H.S became well-known internationally and “Made in Taiwan” then became synonymous with high quality and durability. Note: Jupiter was introduced in 1978 or 1979 according to other sources, though first in Europe with different logos used [including a blackletter font also used for the last Swallow instruments, and the Centurion line]. Quality...varied a lot still.
1982: K.H.S. began to design and make alto horn, baritone horn and euphonium. Note: this may have been at-scale production, versus prototypes and possibly late-1970s examples.
1983: K.H.S. began to design and make clarinet and flugelhorn. Note: as above, this may be at-scale versus small-scale or prototypes/modified production designs.
1984: K.H.S. began to design and produce sousaphones.
1985: K.H.S. began to design and produce French horn. JUPITER Band Instrument, Inc., was established in Austin, Texas, U.S.A. Note: the latter was partly due to a shady buyout of Spencer Eudy's firm in Austin, giving KHS majority control and causing a despondent Eudy to sell his remaining portion to KHS.
1986: Begin to make Bb Tuba. Note: serial numbers reset to 500000 and begin using a stamp with narrow, "pill-capsule"-shaped digits, which they continue to use to this day.
1987: Instrument manufacturing is movied from Taipei, Luzhou to an expanded and improved factory in Chungli, closer to central Taiwan.
1995: K.H.S. established a new manufacturing base in Tianjin, China. Note: eventually, parts and entire horns will be produced there. Tianjin/Tientsin has been a major player in Red-China instrument manufacturing.

Leblanc turned the Galaxy name from a Holton subline into a Martin stencil name, originally applied to Yanagisawa saxophone stencils, then later applied to KHS stencils from Taiwan.

The cornet is a Yamaha YCR-233 imitation, with the square-knuckle tuning slide and shepherd's crook bell, and Amado waterkeys.
KHS's straight-bell version was the Jupiter SCR-522 [based on YCR-231], and the British-style short cornet was the SCR-520 [looks like Besson with additional knuckle slide to A], so the Galaxy and others like it are a hybrid without an exact Jupiter equivalent.
The trumpet is a Yamaha YTR-231 or so equivalent, which became the Jupiter STR-300 later on.

Some models that became the:
Jupiter STR-100 - student model, bottom-spring valves, virtually a Conn 15B Director lookalike - "STR-107" on some early stencils
[KHS] STR-201 - sometimes touted as a "deluxe" model, with barrel-spring pistons modeled on Conn 77B Connquest, but the standard height of most trumpets - "STR-201" appears on some early stencils
Jupiter STR-300 - intermediate model, top-spring [exposed, single-guide] valves, modeled on Yamaha YTR-231
Jupiter STR-600 - higher-end intermediate model, top-spring [exposed, single-guide] valves
Jupiter STR-800 - semi-pro, lesser-seen, top-spring valves - modeled on KHS Centurion - Heisig stated the Centurion was the KHS take on Benge Los Angeles designs

https://drive.google.com/drive/folders/0B125S8bNnBMTfjRKN0F4MUJrN3dMeGVCenVUWHdWX1lCUWk2endla0UwdjY0c243LTZKUUE?resourcekey=0-mBnpKZ5eAxSQnGAHau7Bhw&usp=sharing has many of the images and valves

https://drive.google.com/file/d/0B125S8bNnBMTeW9tTEw5LVlSblk/view?usp=sharing&resourcekey=0-vuiQvqBNMStF8nVykJV9VA is a large list of serials compiled - the main ones of interest start around the 500000s