I varnished the pieces individually. I use water based varnish. I like to wipe it on with a rag. It leaves a thin coat. So I give it 3-4 coats until I feel it is covered well. Varnishing first also makes glue clean up easier.
I always dry fit just in case there is a burr or other fit problem before I break out the glue.
The green tape has marks on it so I get the lower rails all positioned to the same height. I left a little play, (vertically), in the tenons for wiggle room. The upper rails line up flush with the tops of the legs.
All went well It glued up nicely and almost perfectly square. Then I glued on the corbels.
Here is the final glued up frame.
Hopefully I’ll have it finished soon.