I scratch built a laser 3D few months back, its hope less with OS 46, my friend has GSM 75 on his Laser, it does good hovers and verticals. But still we don't have enough juice to bring it to decend in hover or to accelerate verticaly if one is in bad attitude. Planing to put up a Surpass II 91 in mine............lets see how it works. Will send you the pics.
happy landing.
Dr Malik