Man. I looked at the first page and with what ya got, DAMN I'm droolin'! I mean SHIT man thats NIICE!
Now my model building ways, I can replicate this baby with ease, for me it take some time, (I'd have to round up a few details from what I seen on the first page, with the lathe & Mill BUT thats OK, I'm good for it as I'm sure you already know! The M/T valve covers my friend I JUST MOLDED Those!!! -SO I can replicate your entire engine with no issues of finding parts!
From here, I'll leave it at that.... and take it to PM.... As I think for which ever way you go with it, you could "tell" me and I bet from word of mouth, I can STILL replicate it!