Not seen any on my travels. We could do with more SR slam door stock. The AP Mk1s would be good for a 4CEP conversion.
There is someone on UKTS making a series of mark 1 based stock, mainly carriages but has shown some EMU's and DEMU's. There is a thread in the stock building section of the forum. He might be including one, I cannot remember exactly.
Yes it looks like an interesting project. I am hoping we might see some more first generation DMU's and AC EMU's too, emanating from it. Peter