I built both the GP Aeromaster 60 and Lou Andrews Aeromaster 60. Both version 3 and both with ST 61 (ring and ABC). Neither has flown yet, and both have cg's about 1/2 inch forward. I just converted fuel tanks from round to square. Both turned and twisted the fuel/vent lines when engines were started. I didn't add the cowl on the GP Aeromaster. I blunted it off and used a 3' spinner. Not bad but not geed. I built the Lou Andrews as hown on plans. You plane looks very good....