Yea, is plastic sheets that come in different thicknesses & you can use them to cut & stack & etc...to build your motor. Because other members on here have used that too build their own motor. Also I think there is a thread on here or maybe its on XMF? But it tells you what thickness of that plastic is best too use for xmods.
Also the black lip looks really good.
EDIT: here is the link:
http://www.xmodsforum.co.uk/showthread.php?t=10019
May come in useful for what your doing. Hope it helps.