Popriv, Do you have this airborn yet?
I have a Midwest Aerostar .40 myself. Got it in 1990, built it and flew it back then as my trainer. Flew it intermittantly over a period of 8 years till I crashed it due to a bad battery. It was rebuilt and mothballed since 1999. I Just recovered it and put gear back into it this past week. I sent an email to Midwest asking about the CG placement. I recall it was on the spar or just in front by 1/4" but I'll post if I get a reply from Midwest. I put all my electronics and battery up front where it was secure just like the first time I flew it. I also put some stick on lead weight on the tail like I originally had. I fly a 10 oz tank in it. Check the cg when it is empty tank and everything else loaded into it.
I flew it this morning in a moderate wind of 10mph for 1 flight just before work. She took off easy and sure did float well on landing. I'm still using the original os .40 ringed engine I had in that plane when I puchased it from the LHS.
So now I know there is at least 2 of these out there still