i use one of these for doing my brake pipes ....
https://www.ebay.co.uk/itm/Brake-Pipe-Flaring-Tool-Professional-In-situ-3-16-SAE-Hand-Held-FL29/121917694750?epid=1252466557&hash=item1c62dc631e:g:uaIAAOSwVLRadDPj:rk:28:pf:0
few quid more , but dead easy and a lot less fiddlier to use than the...
Looking good.
Doing the rear cross member, I used a couple of acro props through the rear windows to prop mine up.
Wound up the props to take the load, took some datum measurements, and chopped out x member.