(Edit below)Ummm... OK?
It's your decision man.
I would expect more snags though. It's just the normal life cycle of any prototype. The more complex the prototype, the more recurring snags, and your proto complexity level is pretty high.
How about this thought. If your marquee is removable... and you build you cabinet... and it constantly bothers you... couldn't you just bend another marquee later? Like after the rest of the cabinet is done?
I personally allow certain things to slide on a prototype, based on one simple rule:
Rule #1 - If I can tweak it after the prototype is complete, and it does not require me to alter some other aspect of the construction process, I move on to the next step. (AKA: the "Progress over Perfection" rule)
Please understand that I do not consider my rule a free ride to be a screw up. Based on your previous work, I don't suspect that will happen though.

This rule allows me to finish my project and/or move forward to the next setback, whichever comes first. Then after the prototype is substantially complete. I tweak it to perfection.
Look at the bright side! The second one you build will be a piece of cake, because you already know where the setbacks will occur.
This has been - Deep thoughts from Dave.
BTW. I was starting to wonder what happened. So much momentum there for a bit!
Edit/Add: Reading through strikethru stinks! On read #3 I noticed that the marquee is wider than planned. How much? Can you adjust for this "revision" in your 3D model and decide to love it or hate it? Is it $60+ too wide?
Just some

to ponder