Theres no harm in starting fairly barebones and building up your racing operations bit by bit in-game upon release, its remarkable how easy it is to start with modest intentions and quickly find ways to dump a small fortune into it creating something almost 'end goal' like.
A couple of bikes and a Freelancer would probably give you a decent view of the game for a reasonable outlay. It lets you all jump into a ship and see the universe while its being built, get a decent understanding for what your needs will be. The Constellations would be the same, perhaps more involving for a group of 5 people, without it being unmanageable with only 2-3ppl online.
No mention for the Starfarer as a contender though, shame on you folks
Tons of fuel storage to not only get you from race to race, but to supply the racers too, potentially even selling it at the venue. Im pretty sure people have jammed a couple of the tiny ships in them, and we saw the GC demo they opened a dragonfly from the rear of the derelict Starfarer with plenty of room to spare. Im sure you'd get 2 in, plus plenty of spare parts.
Custom paint is something they've mentioned, though we dont know the extent of customisation we'll be able to have. It seems more likely there will be various templates and say 4 colours we can select, as opposed to having custom skins we'd be able to create. Logos (org branding) shouldnt be an issue, either.
I'd definitely try to manage expectations in terms of planetary buildings, im pretty sure we'll get that, but going further to the point of being able to place down items to create a race course seems extremely specific and niche. It could eventually arrive after release, but i think at release we'll have a fair handful of venues for racing, and hopefully they'll add more down the line. Being able to create a circuit in space or on a planet would be complex and brings in questions of people having the ability to fill large areas of a planet (considerably larger than a structure, tiny on a planet scale) with object and essentially littering. Coming up with solutions to keep things presentable just adds further challenges.
Theres a lot of steps that would need to be implemented before that level of openness would be considered, obviously just having the ability to place/build a structure on a planet is something we're not certain of (it does seem very likely, or at least something they've hinted they're working on trying to achieve even if they're not openly talking about it) but would be a huge step. Then you'd want to be able to do something with them, like add storage, hangar bays, accommodation, recreation etc. After that, something CIG mentioned very early was the possibility that people MIGHT be able to operate factories. The problem then was all planets were created, something only existed because CIG put it there, so there could only ever be a finite number of factories and the whole community would have to fight over who owned them, with the richest orgs likely to come out on top. If we can construct factories to do a degree of manufacturing, processing, research etc this way, that finite issue goes away. Those are only realistic hopes. Maybe you'll be able to find a planet with canyons to race through, place beacons down and do something with that, but sadly its still quite a stretch to implement it in some way that feels authentic and not a mess-around between a few people. I love sim racing, this is the only time ive ever been remotely interested in a space game, and my org comes from sim racing roots back in 2004. So not knocking the vision or being a party-pooper, just trying to put it into perspective so you dont come to the conclusion we can do pretty much anything we like and end up feeling like you've been BS'd.
Glad you've found something you're passionate about setting up and trying to dominate in the universe though, it does seem like theres so many very different ways people will be able to enjoy the game side-by-side with everyone else doing their own thing, people wanting to discover different forms of life, create trading empires, huge mining operations etc. All doing something that generates a demand for a service somewhere else, even pesky pirates.