Thanks for the detailed advice!
OK, got the blue AE front springs, shorten ball cups and also put the front roll bar back. Only thing to sort out now is the pistons in the front. If I remember rightly, didn't the old Cat pistons just have one hole at the edge? I saw this article by Phil Davies and it says he used 1mm pistons. Is that two holes of 1mm diameter each? I have some TRF blank pistons I could drill out.
Cheers