Looking good.
Can you do the rest with it bolted to the tub?
I'd hate to see it not join up after all that work.
Here's what I would do with it.
I'd cut the original dash out and secure (float) the new dash in place. Bridge the gap with foil tape. And lay up the gap from the inside.
A while back I needed to move my dash to the left a bit. HVAC foil tape works really well as a backup for glassing. You could use anything to hold the new dash in position. I use lots of sticks and hot melt glue.
If you can raise and flip the body over, you can stand while you work.
If you do all of your glassing on the inside, it's easy to finish out. Just a bit of body filler.
I may still have to use the foam to create a mold in which to glass over.
Perhaps this picture may give you some ideas. The bottom of my dash is a piece of 3/4"x3/4" square tubing. It is supported by the same tubing on either end that goes clear to the floor and connects to a piece of 3/16" plate that extends inward and stops over the frame creating a strong body mounting point to the frame. The tubing in the bottom of the dash mounts the homemade column drop and it is completely wrapped in glass creating a feature that compliments the feature that wraps over the top of the dash.I will really have to think about this before cutting. The original body is a 1/2" back behind the column mount. I would have to build the aftermarket dash out a 1/2 inch regardless. Its not really a structure issue any more if the foam is eliminated.
I not as lucky as you to have a forklift in my 2 car garage. I could hang it from the trussing with some ratchet straps if I was very daring.
This one has me puzzled. I may still have to use the foam to create a mold in which to glass over. I would like the metal bar of the column drop to be covered.
The tubing in the bottom of the dash mounts the homemade column drop and it is completely wrapped in glass creating a feature that compliments the feature that wraps over the top of the dash.
I like your dash, clean, symmetrical, not cluttered. Nice! That is similar to what I have in mind for my project. What did you use for the plate? I salvaged a nice large piece of brushed stainless steel from a side by side refrigerator door that I have been contemplating incorporating on my dash. I am not committed yet. I really like the look of the auto meter American Classic series with the stainless face plates, but I'm still choking on the price... When I bought the bucket, it came with a old dash plate gauge bezel that is shaped like a '32 dash center section, it's Ss with a brass plate in the center. I like it, and it's different than most I see, but it only has provisions for one large and four smaller gauges, so I'm on the fence because I want a dash mounted tach that matches, and the symmetric thing...Perhaps this picture may give you some ideas. The bottom of my dash is a piece of 3/4"x3/4" square tubing. It is supported by the same tubing on either end that goes clear to the floor and connects to a piece of 3/16" plate that extends inward and stops over the frame creating a strong body mounting point to the frame. The tubing in the bottom of the dash mounts the homemade column drop and it is completely wrapped in glass creating a feature that compliments the feature that wraps over the top of the dash.
Jim