AUG,

If what’s bothering you is cosmetics then I’ll tell you that the most important view of the plane is the bottom (flying).

There are reasons for using rubber bands on trainer wing:
In case of hard landings I’ve seen rubber bands tear, nylon bolts never brake, the wing and fuse do.

Wing with bolts has a wood dowel in the leading edge to hold it in place and more important it has reinforced structure of glue and wood around it inside the wing.
Also the back of the wing with bolts designed for bolts, pushrods wise etc’

If I could I would use rubber bands in every plane I have over nylon bolts.

If you are missing a nylon bolt you are not flying, while rubber bands are endless.

There are a lot more reasons to use rubber bands over nylon bolts.

Just my 2 cents.

Alex