The tail skids must swivel unless you can guarantee you will never land in a cross wind or swerve on take off or landing. The booms are long and relatively close to the ground. If you fix the skids rigidly the stress you put on the tail end of the booms if it should touch the ground while running along during take off or landing is much higher than you would believe. That's why I went to the trouble of designing them that way!
As for the gear screws, all my landing gear is fixed exactly as I say. Small screws. It's like a fuse in an electric circuit, if something has to give, let it be the thing least damaging. Put one of those small screws supplied in the kit into a piece of hard wood and just try to pull it out.

BUT, you are a jet flyer, so you should be experienced enough to make your own decisions and stand by them. Do your own thing. I just do exactly that. Not always right, but hundreds of flights along, my old jets are still plugging along.

Go for it!

Alan