You are a good man scaff1989, if you ever want a working holiday to give you a taste of another firm give me a shout I think I would enjoy putting a job up with you before you hit the big time, you have asked me more questions than boy's that have worked with me for 3 years. I especially like your soly's gong the same way and brace gate to gate, some might not notice but the men that count will.
First thing is tubing brace doesn't have to zig zag or dog leg as we call it, it can be all the same way depending on how you see the job. There is a few threads on it and a few think it goes in at the bottom and out every lift above that or is it the other way round but the truth of the matter it doesn't matter a jot.
The 300mm node point thing is to accommodate the toe board on a working lift that's why we brace double at the standard to swivel at the bottom, for more specifics than that I would need to check tg20 to be sure.