there was a discussion in one of Dre's other threads about the plastic intake manifold, it is actually not a bad thing, alot of higher end vehicles use them because there is a great reduction in heat soak, and technically it isnt plastic, it is a hard compasite material made for engine parts like that, or so I have been told.
The engine looks great and seems like it will benefit well from bolt on mods but I will wait to see some dyno numbers first. I kinda like how it is opposite my engine with the exhaust manifold in the back and intake on the front.