I give you a lot of credit for jumping in with both feet, making this particular pattern your first attempt at taking on an Intarsia project.
I hope it turns out a success, showing that it not as hard as everyone thinks and maybe it will inspire more people to their hand try it,
I've never used a spray adhesive so I can't offer any advice in it's use, but I've never found Zebra wood to be oily. Scotch tape sticks to it with no problem.
What you have done, so far, is looking good, keep us updated.