Hi Philip, for a first time serious build, there's nothing to be ashamed off!
It looks quite good.
There's enough said about the added on gear, so I'll just give you a tip on the soft tracks.
Most of the time these soft vinyltracks are coated in a substance (release agent) which makes it easier to get them out of the mould. You'll notice the tracks feel greasy. A good wash in a soapy bath will get that off and then painting is a lot easier.
You can best paint them after you fitted them to the vehicle, otherwise the paint will flake and fall off.
Untill your second, serious build!!!