[LeoCor Replicas]

Been wanting to make a belt gizmo replica for a while, but I'm not sure what to use for the base board. I know there's already plenty of complete replicas and kits out there, but I'd like to make one myself that still uses a calculator board, ideally without paying the $1000 cost that the ICC-808D model goes for now.

Any recommendations for alternate calculator models would be greatly appreciated.