8X4 router build advice if possible for a total novice please?

[JAZZCNC]

I'd be tempted to buy 2nd hand
https://www.ebay.co.uk/itm/CNC-Route...h/184247662175

Auctions like eddisons aren't a bad place to start lots of companies going to go bankrupt in the next 3 months.

Not starting at 8K plus Vat I wouldn't. Then you are still stuck with a Chinese made machine that's using a DSP controller that is notorious for failing and is probably what he mentions in the description when he says the engineers replaced the control board.!... Knowing these things it will be running standard DC steppers on Cheap drives as well.
The fact It's less than 4yrs old and already had main controller and spindle replaced says it all.!

It's ok buying a used machine provided you know what you are buying. But when your talking 10K + which by the time got it back home and up and running can quickly turn into 11k.
Then you still don't fully know how much wear n tear is on it so leave another 1K + in the budget for repairs or replacement parts. Then it gives you a lot of room to build a great machine that will do everything that one will. You'll also have a machine with much better quality components that are brand new so you can sleep easily for awhile knowing it won't need costly repairs.

Second hand isn't always the way to go, esp if it's come from a working environment and not been refurbished.