So I rode Kumagutsa again today.
It's a LOT better than last time - its had a grader over it in the last few week - track is now a decent width all the way around, and a lot of the square edges have gone.
Apparently an MA track inspector was out to look at it during the week, and has not demanded too much - mostly some tyres around trees near to the track.
The ARE piles of dirt that are going to be ripped into the track six weeks before the event. I still reckon it needs more organic material, but it should be alright. One comment was along the lines of "it's only really being prepped to race standard for the CMX Titles, we're not building it as a full-blown long term race track" (NB: not a direct quote).
There's still plenty of rocks - I copped one on the face-guard of my helmet at a good speed. Hopefully the soil on top will hide the vast majority of them.
And, the most important bit: it is actually a lot of fun. I did about twenty laps. There's one bit where there's a long left hander into a short, relatively steep hill - the hill is straight, but you sort of are still turning left up it. Both bikes could be held WFO up the hill, with the front wheel off the ground, steering by using The Force alone.
Goddam it's fast too - with no "race face" and an unprepared track, I still saw 85kph on the modern.