you call that relative cheap?

the gmaxx comes with dogbones, drivecups, front and rear skid

I call it relative expensive.

Well, the G2 cf is $328, whilst the Xtreme chassis is $170. Granted, you have to supply the chassis braces for this chassis, and there is no kick-up to the front skid, but it is a more-or-less complete chassis. That said, the G2 is miles better in terms of quality & looks etc.

The front kick-up is built into the bulkheads.

Ah, well, its not though. The front skid on the Maxx is angled upwards, and the bulks mount onto it which tilts them back, giving them the kickup angle. Where the upper-plate of the Gmaxx chassis (or chassis plate of a stock chassis) attaches to the bulks there is an angle to the bulks so that everything lines up like a jig-saw puzzle. Side by side though, there is no difference in shape really between the front and rear bulks- but they obviously arent interchangeable. I think these pics show what I mean best:

http://i115.photobucket.com/albums/n...os/gmaxx24.jpg
Front- imagine it is tilted backwards a few degrees.

http://i115.photobucket.com/albums/n...os/gmaxx26.jpg
Rear.

With the Xtreme chassis the skids are built into the chassis, and there is no kick-up to the front skid- I guess when you tighten the bulk into posistion though the skid will flex upwards to the correct angle?...

Yes, the top and bottom plates bend to the angle of the bulk.
Doesn't sound right, but I've been accidentally trying to break it and I haven't succeeded yet.
Only problem is that it's not extended, and since the bottom plate goes the full length of the car I don't see how you could fit the mono block extension on it.

I see what you mean now, but like I said, its built into the bulks. Its also built into the skid, which I left out, but I see your concern about how the chassis has the skids built in, so that could cause problems.

If you really wanted to extend one, I would simply cut the rear off, drill some holes, and use a regular skid...

Theres nothing a Dremel cant fix it seems. :D