Before you go much farther with the front section you have shown there, decide if you are going to try to make your own front suspension, or if you are going to buy it from Jack McCornack. I'd really suggest the latter, unless you have major suspension experience, like maybe FSAE...
If you are going to buy it from Jack, then you may want to rebuild that, and angle the side tubes (LA and LB, I believe). I didn't do that, and mounting the front suspension was a real pain in the ass.
There's his page on the suspension and there are pictures of his suspension on my car there. Towards the bottom you can see where I had to use two-piece brackets for the rod-ends, whereas if you mounted LA, LB, FU1 and FU1, you would be able to use normal brackets and save considerable time.
Other areas you might want to consider, if using the original "book" frame, or the McSorley frames (much more accurate than the book--my frame's a few millimeters short due to discrepencies in the book), are the engine bay and, of course, the rear end from the back bulkhead on back.
I'd wait on making the engine bay tubing until you have the donor engine available. I made mine way too wide, figuring mine'd be wider than the book considerably, since it's a bigger engine... and that costed a lot of time and effort to get it to work. On the other hand, if you stick with the book engine bay, you may end up with your engine sitting higher than mine.
And then, of course, there's the transmission tunnel, but that's usually the last part to complete, or at least, it was for me. I still haven't finished the tunnel--I want to make a second driveshaft loop towards the front in case of losing the driveshaft.