Hey gang, I will be boxing the C channel in my 72 Lark, in addition to other frame mods. Keeping a dead stock interior so no cage, and 600 hp from a 462 will be rough on a stock frame. ABC plates are simple, Hellwig seems overly complicated. I started playing with some scrap left over from scratch building hot rod frames. Cheaper than either “kits” and probably stronger! Two design ideas, both use a nice long piece of rectangular eighth inch wall stock. One, a 3 x 1.5 oriented vertically would close up the open face and essentially be like two boxed rails together. Just clears rear foot wells and avoids dealing with the center body mount. Pretty easy to cut the ends to extend along the factory boxed areas of the frame. Sorry, no visual Second, a 2 x 3 in at an angle kinda creates a slope similar to the convertible frame. Kinda creates a box within a box, leaves a great space to route fuel and brake lines. But would have to monkey with sleeving that body mount or create another. End cuts get more complicated but could finish off with smaller plates transitioning into the factory boxed areas. Which would you do...or any other ideas?