Those colors are very crisp and bright, nice!
Never seen the rotary cutter, is it like a pizza cutter? I hated using a box cutter as the blade would tend to follow the grain.
I first started doing this type of work with the blue tape just like you are. A real game changer was using just the contact paper (WalMart shelf liner) and securing it to a piece of melamine. easy enough to reposition stuff and you can "push" the pieces sideways to close up a seam. If there is some more profiling to do it is easy to take back out and reshape.
Once everything was in place, the melamine became the vacuum press lower caul. I just rolled on the veneer glue to my plywood panel then set this on top of the layout. Another caul and then into the bag.
Zero glue up anxiety and stress.
After pressing and some dry time, the shelf paper can easily be pulled back off. Only thing is knowing that the show side is down when placing the parts.