The Testastretta model was made already in 2002 with only one half of the parts = the inlet camshaft and the inlet valves.
The perspex model was ready to take up the outlet parts as well.
(lack of) money was the only draw back here, because at that time only new and very expensive parts were available.
Nine years later (spring 2011) I completed the model with new and second-hand parts (sponsored by Biggelaar Performance; Oisterwijk, Holland) for the outlet side.