Very nice idea. Just an FYI, Fabcraft used to have tubes like that with extrusons on one side for added surface area. Not sure what track clearance allows there.
Sure looks like you put allot of effort into it man. well done.
On your next build, do like I do on the xp's. cut the two down spars and wled the intercooler into them . it makes for a stronger chassis and allows you much more room for the headlite or hood.
I will post some pics in a month. i am working 60 hrs a week so my sled time has been cut down to zero !!!