I get the picture, but then I've vacuum bagged CF before. Had an autoclave to play with too, heehee.
The bottom will definitely be tricky, so I would like to see how you manage that. Does it have to be carbon fibre? Why not glass, which is often easier to drape? May also be easier to work the resin into glass cloth than cf?
I sort-of recall that bagging can be done with multiple pieces - hard to describe in words. It looks like you did the body today with just one big bag, which would have left a lot of empty space underneath between the front wheel fairings. I think I can see that in the photo. The key is the way to bag around the mold, because areas where the bag "tents" over a corner will not be compressed, so I think the trick is to assemble a bag with many sections... Literally cut the bag, letting a long free edge hang, then stick on the next piece to the free edge, which will wrap onto the next side. Like, one for every major face, with lots of free edge. Join the edges with putty. Slowly apply the vacuum, and if it becomes obvious that the bag doesn't fit, don't proceed, rather rip off the bag and put in a new section with slack where it tented up before. Be prepared with the materials ready just in case.
It was all pretty thoroughly planned in advance when I did those projects (long ago!). I think you'll be improvising as you go with the one-off project, and from what I've seen so far, it will go swimmingly.