It's no big problem, I think. I allowed myself to make info-graphics:
- red: position in accordance with the 1200XL and each XL / XE, at the top of the housing
- green color - location on the front of the housing, compatible with Atari 400/800 and each XL / XE
- yellow color - at the top or front of the housing, low microswitch is flush with the housing
Another thing - a switch and a cable for the A400 / 800 flap - I recommend a small hole from the edge of the A400 / A800 flap that will be released (a small dremel or a small drill bit the width of the cable). Additionally - by adding two cores of the cable, the switch to the AVG-cart can be placed on the SIO plug.
As for 100+ units - I will give you this price for 51 cases, provided that one AVG cart is for me (paid, at cost plus shipping).
Sorry for google translate but my english is bad.