I would think the laser fuses would be fine

Nonsense.. Flanker was designed as a direct counterpart to F-15, an air supremacy fighter.
Where do you get your bomber destroyer claim from?

All soviet fighter aircraft were bomber destroyers. Su-27 began as an ambitious program to take on F-15 dominance, but they realized one aircraft couldn’t do it so they aimed towards heavy (Su-27) and light (MiG-29) divisions. But they’ve always retained the bomber destroyer mission of their previous kinfolk. To deny that is to be disingenuous.

The soviets primary focus were trying to catch up with western look-down shoot-down capabilities. The Su-27 was not necessarily designed specifically to slug it out with F-15, its main purpose was to prevent high speed and low altitude penetrators (Tornado, F-111, B-1, etc.) first and escort of long range attack aircraft (Su-24, Tu-22) second. MiG-29 was designed for agility to gain an upper hand over local airspace.

The fact is the Su-27 was completely dominant over MiG-29 in actual real world usage. But the design was not originally meant to slug it out with F-15.

Flanker was an evolutionary step in bomber-destroyer.

F-15C was an evolutionary step in air supremacy.

Apples versus oranges.

The Mythbusters are correct, which is why glass always looks good under thermal camera, but the surrounding frame looks awful. IR doesn’t pass through very well, but glass can radiate IR. I cannot imagine throwing a glass skin over a tank since tanks already blend in so well once cooled down to match terrain. Tanks reveal themselves best when mobilized, but are quite stealthy when the engine is off and it is concealed by the terrain.

It would make sense to use F125, since they planned to build F-CK-1 follow ons, too

F124 means new COG

XAT-5 is akin to L-159, using a single F124 non-augmented engine. Looks quite similar to a single engine T-38.

It’s interesting to note that the Su-27 was supposed to have had a different radar system (a much more promising antenna design and processors) which apparently would not have fit in the MiG-29’s nose, but the development of it stalled so they reused the MiG-29 N019 antenna design and processors. The radar developed for the Su-27M (initial N011 Bars) was then based on the experience gained on this failed design and some others.

What radar would that be? I saw something about scaling up MiG-23MLD radar for Su-27 failed, but that was it.