I have thought about it. I wish it could be done. It probably could be done, but with a cost that might not make it worthwhile (unless someone is doing it for fun). First of all, it would need a new power supply as the IA-1 uses an AT and the epia uses an ATX. The epia does have the LCD controller built in, but trying to get that connected to the IA-1s screen would probably be difficult. There might be other issues but I can't think of them now.
I once took the dimensions (I don't actually have one) of the epia mobo and tried to see if it would fit in the ia-1 case. This was a while back, and I don't think it fit in completely - I think some of the board would end up being where the PS is. But since that would have to be replaced, anyways, then I guess that wouldn't be a problem.
If anyone does attempt this, please post pictures.