@starship_fantasy
Freeplay40
JodyG

All three of these Pinsiders make ramps, so maybe they can make some suggestions.

I'm out on this...I don't touch decals. But a commercial printing shop should be able to help you out.

I’m sure that the custom pin builds have been documented here on Pinside. You might want to post in the Restoration forum, maybe the restoration question subforum.

Zitt Any suggestions where he can post his question?

Mr_Tantrum on here makes some cool stuff. Not sure if he's made any underside ramp decals though. Can't hurt to ask.

I would recommend farming it out, the added bonus is that you can print white. I've had good results from both vistaprint and signs.com. If your mounting them under the ramp choose inside-glass as the print surface. Vistaprints 3m material is much nicer to work with but you are limited to their specific sizes. The downside of the 3m material is they have micro air release channels, which makes getting small air bubbles out easy, but leaves anything more than 1/4 inch behind the clear part of the decal looking frosted. If you want optical clarity beyond the ramp I would go with the signs.com decals.

https://www.vistaprint.com/signs-posters/car-window-decals?xnid=TopNav_Car+Window+Decals_Car+Signs_Signage+and+Trade+Show+Displays&xnav=TopNav
https://www.signs.com/clear-window-decals/