I used Ultracote for base and trim.
Pic 1: finished bottom - the base is red with white and yellow trim - no perforations. Trim applied with a very low heat, socked iron moving, very very slowly from one end to the other. Same technique used for both wing and tail feathers. No bubbles.
Pic 2: finished top - base is red with white and yellow trim - sharpened T-pin used to perforate under all trim. Trim pieces were cut and laid out as stencil and outlined with sharpie fine point as boundary for perforations. Trim applied with a very low heat, socked iron moving very very very slow ly from trim points to broad ends. No bubbles.
Pic 3: finished side view
Pic 4: finished tail feathers - base red yedda yedda yedda - no perforations. Trim applied with a very low heat, socked iron moving, very very slowly from one end to the other. Same technique used for both wing and tail feathers. No bubbles.
Pic 5: finished side - yellow base laid down, then red base overlapping yellow, then white trim applied - no perforations. Same technique. No bubbles.
Pic 6 thru pic 8: application of white trim over red

I had to remove-replace several pieces because I moved the iron too fast resulting in captured bubbles irrespective of perforations used / not used. I can't over emphasize that the iron needs to be moved ever so slowly.

My favorite LHS owner (one of our best builders) looked hard and long for bubbles - he commented that this is one of the most "bubble-free" coverings that he had ever seen. The above technique must work.

I also played with Monokote Trim Solvent to prep the Ultracote adhesive. Did it ever!!! Too much for a rookie like me - you need to get it exactly on the mark. It sure did a great job as a heatless method - and fast. Seems that if you had a way to lay a trim piece adhesive side up with one end applied to the base and THEN be able to roll the trim on with a the flat side of your hand or dowel or one of those pet hair removing roller with a handle on the side ... emmmmm, where's that pet smart store ...

This RC stuff is way to much fun ...

"edit comment: can't count sorry"