I posted a (sort of) build of this engine - from a "kit of parts for machining" here :-
I have the "plans" which were part of the kit - a very long booklet of pages showing each individual part, plus a couple of g.a. drawings and some very poor instructional hints reading like they were written in Chinese, translated into Albanian, then re-translated into English.
Not an easy thing to get running I found, and I had to adapt one or two parts from those prescribed in the plans.
If you cannot source them elsewhere, as Ken has kindly offered, I can try and scan them too - but there's a lot to do - take a while.
Do p.m. me if you need any help in the build - it is a real bugger to get going.
My "kit" of parts came from Axminster power Tool Centre, here in UK - a friend of mine who works there has since told me that virtually every kit they have sold has been returned with some very ascerbic comments and demands for "money back" as the disatisfied customers generally consider the kit/plans as a load of c**p !!!