Hi Mike
I wanted to run a 65 RE and SE run, that turns out not to be a go, So I will look at running more 75s and 65s RE only, the 65 will be a Merlin 65 based on the 75 case, This will make for an even better on more stable 65, This will be necessary because of the expense of the Foundry that does castings. I will get back to this project soon, Right now I am redoing and putting the SV laser cut kits back in stock, and making NEW airplanes into laser cut kits, plus I am developing new products and concentrating on getting Cf PIPES back in stock, I have stock on most of them now, except for the 75 pipes I am filling the back order quickly now and look to get them back in stock in the coming weeks
If I started the new engine run NOW it would be at least 6 months before I got parts in, then time to build all the engines, so the answer to your question is if you need one quick, you would try to find a person that had them for sale
Regards
Randy