[EHaskins]

The C-Base chassis is more flexible in terms of designs, since they use the corners brackets in stead of end caps. We haven't fully assembled ours, yet, but it seems like it won't have any structural issues.

I don't see any reason not to use the C-Base chassis, but since you have several IFI chassis already they may be more practical.

Unless there is a specific rule regarding the IFI kitbot, then normal cost accounting and parts use rules apply. There shouldn't be any issue with using the IFI chassis.