those £55 usb bob's and those £5 tb6560 drivers pic for scale of them = tiny!!

[Neale]

You clearly have a way to go before you understand any of the components that you are trying to string together. On the hardware side - why are you trying to use an H-bot at all? Do you have any sound reason to choose this layout? Have you thought that the reason that no motion control software apart from those designed to run 3D printers supports H-bot layouts is because H-bot motion is really not very well suited to any kind of heavy-duty work? The main advantage is to reduce the weight of the carriage by taking the motors off it - and then you're going to bolt on a plasma cutting head plus all its connections?

On the software side, if you don't understand yet all the stages from initial design, output in DXF, conversion to g-code, and g-code to mechanical motion, then there's a bit of reading you need to do there.

Is it possible that you haven't had any sensible answers on any of the other forums where you have been asking the same question because no-one can understand where you are coming from, and they don't want to talk to someone who goes out and buys a pile of kit that is entirely unsuitable for what we are guessing you want to do?

There are plenty of people on this forum who could help, but no-one's heard a sensible question yet.

Well, OK, I'm going to stick my neck out here and answer the question in the first line of your last post. No, absolutely nothing is OK with this project. You are buying the wrong kit to build the wrong design, and the chances of you getting it to work, given your current level of knowledge, are so small as to be non-existent. Take a look through the build logs, and in particular the recent one on building a plasma table. That will show you what a successful machine looks like. Start from there, and start thinking about how you might scale it up/down/sideways to do whatever it is you want to do. Unfortunately, what you've posted so far is about as likely to get you help as a request for a perpetual motion engine.

BTW, you haven't looked too hard for the pulleys you say you need. Try here, for example. But you probably don't need them...