Sorry everyone for the long delay. In addition to being ridiculously busy, there were lawyers and mechanics to consult with before I could move ahead with this. Attached are front/back renderings (minus LCD) and a schematic.
A full kit will be priced between $35 and $40. It will include everything but the following (because they're dependent on your particular install):
- RJ11/telephone cable ($1 from most dollar stores, in whatever length you need)
- Wire to connect GND, +12, VSS, Injector to the engine-side terminal box.
- An optional fuse + holder for any of the above lines.
- An enclosure and mounting system.
Note: the LCD isn't displayed (no model) and the jack on the right-hand side is actually smaller and black (but again, no model).
To assist people's imaginations. This is the inside of the RJ11 break-out box for the engine side. The cord connects to the jack on the front, then you'd run wire from each terminal to wherever it needs to connect to. They can either be screwed down or affixed with double-sticky tape (both included). For reference, the background is a (roughly) 1cm grid.
Assuming no-one spots any show-stoppers, these will go off to be fabbed this evening. They should be back by the middle of next week and available by the end of that week. I currently have four massive boxes of parts sitting here for them.
As an aside, they'll use the Newhaven NHD-0216K1Z-FL-YBW displays. After going through about 40 different models, these have the best visibility and temperature tolerance. (They could, of course, be replaced with virtually any 2x16 hd44780-like display.) Aside the aside, more than one other model had an LCD capable of rather cold temperatures, but controller electronics that did not function at such temperatures.