Its always the same story. Don't buy off-brand if you intend to race. Find a used T4 and don't look back. Everything else is false economy. Racing is expensive and what you initially save on the car price will be quickly made up in broken parts, sourcing off-brand repair parts, and frustration in repairing/sourcing when you should be racing and having fun. I see it every few weeks at our track. New guy shows up with an off-brand, then eventually realises it sucks after assuring the club it's fine and he likes "racing something different." There are about to be a bunch of used 2018-2021 T4's dumped on the market (many with copious spare parts). Wait a few weeks and grab one of those and you'll be much further ahead.

*Xrays come with excellent manuals. If you don't get a manual with the kit they are available online plus lots of great videos on building and set-up. Honestly I hate to sound like a fanboy but its the only way to go.