frikosal:
"you'll have to devise some means of making your parts easy to attach to lego pieces - might have to adapt some bricks to fix to the steppers for example"Do you have an example of that ?
Not really, no. I was thinking that either you would need to use whatever mount points your steppers had and screw/bolt them to some lego bricks, or make a cage out of those grey technical lego girders to enclose a motor and shim it firmly if necessary. Of course, if you do too much of that, the Mindstorms kit starts to look less expensive 