It really does depend on your cad skill level, but basically you would need to make a mounting setup to incorporate both. it is certainly doable, but tbh I would have a look at some cad files from existing setups, and what may be involved.

to be completeltly honest, it would likely be easier to use a Stealthburner mount for Ender 3, and build a Filametrix Stealthburner which incorporates the whole cutter and extruder into the toolhead, then just make some sort of mount for thr lever trigger. some probably already exist tbh!

They used to be. As of the Mk4 and XL they no longer share a lot of their designs, and the source is also closed.

Very sad to see.

rabies shots, certainly not a fun experience lol

the spacing between the ripples appears to be approximately the rotation distance of the wheels, is it only on that axis? ie. is it along the left/right side from the pics perspective or only the front/back?

i would check the wheels on the axis it appears for any damage or debris, and the wheel path.

You need quite the opposite, more cooling on those overhangs. As you are in the chamber, the heated air wont cause warping like outside an enclosure, so crank those speeds on overhangs. I generally run 80-100% on bridges anf steep overhangs. I do also slow down print speed on overhangs significantly to allow more cooling aswell