RE: Welcome to Club SAITO !
Interesting prospect, this SPA thing. My old mentor has a number of early aerobatic kits that he is just getting around to building. One problem with it though is that the supply of old engines are running out.
We in SAM solved that by allowing modern engines with handicaps. The advent of modern radio is a great boom to Old Timer type flying but you have to be aware of the "old codgers" that really want to use up those old Kraft sets. Though we have solved that problem as well by taking a page out of the US hand book of competitions. We have transmitter throws. The older the set the bigger the handicap (your favour) and the prise, a brand new modern set. You can see the obvious in this I trust