Well you know what, those decals are quite an acquired taste and I really see nothing wrong with them, so I'd leave them as they are unless you really hate them it will cost a few quid to replace the 2 tank cowlings.

A seat cover cost around �38 you just unstaple the old one lay the new one in place and then use a staple gun to secure it. But that is a job best left to a seat upholster or you could make a dog dinner of it with creases all over.

The rust on your spokes can lead to weakness in the spokes so get it scraped and protect them with ACF50 or whatever it's called.

Good luck