Davecymru's Miglia build :)

[EL PRIMER]

^^^^ what he said .

I am not totally familiar with the Miglia framework , so can't fully comment on how their version works

My memory of the Sammio version was that the front edge of the cockpit rear (?! ) was fully supported by the framework to do just what Towed said above.

Even a piece of aluminium box section ran along under that edge and supported by 2 legs of ally box to create a 'goalpost' and bonded in place or fixed with a row of wide headed rivets through the body on the top surface or something similar would help and be in keeping with the whole alewminum interior , maybe ?
Choose a box dimension less or equal to the depth of the lip , 1'' maybe , and you will virtually not notice it.

You can probably use bonding paste and clamp the ally with G clamps and then fit the uprights into place after its cured . no need to weld it together and you could pie cut the top bar to fit the curve if necessary , again , no need to weld it as when bonded in place , it aint going anywhere !

Really liking the way the car is shaping up , by the way , rear light configuration works well , interior is well worth the effort too. This could be a nice little car.