Many, perhaps most who post in the Classic Pattern Forum, have built the 60 and smaller Kaos. The build for the 90 size will be similar. You chose the best place to post your questions. You will get all the answers you need here because most of the guys still posting here, are avid builders.

The regular two meter Pattern column is for assemblers of prebuilt components (big bucks) and not builders per se. Good luck with your Kaos.

I have a 50cc sized Kaos in my workshop. One of these days I will get to it