Looking good chancer. Taking the time to make sure things are straight is going to pay off in the end
Another little tip i found from a German Website.
On the plywood I will screw in place these L Brackets to hold the frame in Shape as I tack it.
Then I can leave the brackets in place and Flip the whole frame over and tack the other Side.
The Brackets make a sort of poor mans Frame Jig.
Also First I think I will draw a Center line and Even the entire Frame to scale, Directly on the wood. So I can line everthing up correctly as I tack.
Measure once, Grind, allign, measure again, Then Tack and Measure again.
Flip over repeat.
Lather, rinse, repeat.
Moving along nicely . The vertical support does look good. It should be pretty strong. The only trick will be to get everything straight when welding
Looking good, I too like the vertical mount, I would use the axle to help jig the two bearings in place and you are using self centering bearings, the upright gussets would keep the bearing flange mounts from flexing during side loads, not telling you how to build your gussets but they can be sliced on an angle if you have the means from wide at the bottom where they will be welded to the top of the frame rail to narrow at the top to where they end flush with the top of the bearing mount hangers, this helps save weight and looks better too.
Those look real nice!So Something like this:
again thanks for the input.