I first tried TT retracts and failed big time. Too much flex under load, I opted for robarts 1/2 inch 650 air with VR valve , they work a treat and look the biz. I like your positive view on the tail ( NOT GOING TO FAIL ) and as for the tank , a pump is needed ....and your choice is the right one.......good luck with V1----------Rotate---------------V2 positive rate of climb oooooooooooooooooooooooooooooopppppppppppppppppppp pppppppps