Welcome to our talking shop - you'll meet some interesting and learned people here and all like to help each other. For me, the hobby would be much the poorer if it vanished ;o))
Alco parts are not particularly hard to come by - and it's the Sodbury Sort out this Saturday. That said, I have a couple of these engines, one with a generator and one without. I also have a spare engine and I'll go and have a look later to see if it has a cowling. An exhaust will be hard to find - in fact, to find one with an unbroken exhaust manifold is quite hard to do. I've modified both mine as they had broken manifolds and made an exhaust for one out of a Coffman starter cartridge.
The generators are less common again and most of the Featherweights I've seen at rallies are sans generator. The complete generator is a peculiar looking device and I'll attach to an off-list e-mail a couple of pics of one in Holland owned by Hans Scholten
Normans made some interesting small engines and I've also got a couple of their flat twins, a T300 & a T600.
Regards,
Kim Siddorn