Here is a link for the acrylic. Really guys this stuff is so easy to work with. I gave it some more thought and it would be all to easy to make the box. Ok
1.Mock up an acrylic box using tape that fits the filter inside and the engine bay.
2.Using a 2.5'' bore bit drill a hole in either end.
3. Using a piece of acrylic tube (2.5" ID) apoxy this to the holes in say a 2" length
4.Attach MAF housing
You end up with a pretty cool looking box that is extremly heat resistant (something like 800deg.)
I am over looking the induction piece but that hasnt really come to me.
Acrylic Sheets - Clear: TAP Plastics