Another Arm for HFM Totem Q250 and Eachine 250 FPV Racer

Update 3/20 Rev B removed one hole. Lowered top line to increase clearance for 6 inch prop.
Update 3/19 I added a revision of the arm with the 3mm pushup for the Eachine Racer. Most notable are the changes in the side panels, which hopefully will reduce the chance of breaking at the lower mounting feet. The space between the arms is large enough to fully contain the standard ESC now. The holes were added to reduce the weight. Maybe there are too many, maybe more can be tolerated? I didn't