sounds like two bad ideas.

That's actually a great idea man, I had a Paragon and I would have done that for sure! As long as the angle of the pf is the exact same and you can add some mirror blades too! I mean why the hell not its just a wooden box lol

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Personally, I wouldn't do any modifications to game that couldn't be easily undone.

If you lower the rear side of the playfield, that reduces the angle of the playfield, and you may have to raise the rear levelers beyond the height of which they can go in order to compensate for it.

So, you could mess with gameplay for the sake of something that's unnecessary.

you would have to blow out all the wood sliders on the cabinet. Lower them down and hope you get them perfectly parallel to each other, as well as being perfect pitch to what was there. Then you have to find extended front hooks because your front is going to sit much lower. Then hope that none of your mechs hit the transformer or speaker, or your playfield pinches your flipper buttons. If all those things check out good, then you would be able to glue your pieces of crap to the playfield.

also drill a new hole for the plunger
put something at the back of the playfield to fill the gap

A simple idea that gets more and more problematic when you work out the details. Is it really worth it?

It might be easier to raise the glass somehow. How'd the guy do it that built that mirror-playfield black hole? Custom cabinet?

Btw this is what I was referring ...

As they say, you can either Raise the Bridge or Lower the River to get more clearance.
1) The Black Hole Cosmic Chaos was a raised cabinet side project (added triangular sides on top of cabinet)
2) The Reverse Flush backwards pinball was a lower the playfield (and reverse tilt) project.

Neither are easy but the raise the cabinet sides project was easier relatively speaking. It changes the length of the playfield glass due to the longer hypotenuse of the angle, although you could use standard glass if you make a new rear glass channel that is deeper. I found that the existing metal side rails covered up the new seam formed by adding the triangular side risers.
You might also need to raise the backbox riser.

Lowering the playfield is more difficult because of relocating both inner side rail supports perfectly, and more importantly the bottom of the playfield interfering with other things in the bottom of the cabinet. But since mine was an EM game so there was a lot more in the cabinet bottom than on a SS game. I had to move some relay racks to stop interference with the score motor.

Alan

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This made my day

And when gap between glass and playfield is bigger, there is plenty of places for ball to get stuck

Gamatron was a conversion kit for Bally/Stern ss games, right?

Instead of lowering the playfield in the cabinet you have, get a Bally cabinet that had the playfield sitting lower from the start – like Xenon, Medusa, Flash Gordon, Vector etc.