Just started the Mercury Atlas I won on the ROL auction and need input, ya'll. 1. The motor hook is too short, which I'd seen reported in EMRR reviews. Looks like it'll handle a D (2.75") well enough. According to thrustcurve.org, Aerotech's 24mm E15 and F21 are the same length. Is that correct? 2. Those mounting tubes for the fin attachments are just begging for a 3-engine cluster. Anyone ever get bold enough to fly it clustered without fins? I reckon it would need a LOT of nose weight.