Originally Posted by Schoenfeld
Unfortunately, there can only be one version: Either this tall version ("prototype 2"), or a flat, wide version. I can't even say which one would be cheaper (I'd guess it's a draw), but that sandwich-solution suggested by Crumb is not an option - it would not help anything (width-problem remains), and on top of that, it would make production a lot more complicated.
If having a sandwitch is not a choice perhaps it could be possible to fit it in just one flat board... it would be slightly wider than the width of an A1200 accelerator but probably simpler and easier to build.
PS: original picture was done by Checker from a1k.org, my ugly red lines show an idea of how big would be the flat ACA500 :-) it probably could be made slightly shorter