Phil, the 'main straight' is right at the back. It is over 30m long, more than long enough
It is flat - been rolled many times, and will be rolled over the coming months. There is a white, low, concrete curb between it and the flat(ish) area I was meaning. When I say flat(ish) I mean there are elevation changes is it, not nasty bumps
The straight/track is designed to run both ways, but I think the "best" layout will be onto the straight from the (over) 12 foot high banked corner - down the straight - and round the slightly banked corner at the end of the straight.
It'll all make sense when we can get better pictures and you see it in the flesh, the pictures don't do it justice tbh.
G