I suspect it will be very similar to the SV80A as far as build goes. I would have jumped on one of these if I knew they were coming out but I just picked up a SV80A. Comparing it to my AT102ED it seems the focuser, tube rings and quality of the fit and finish is the same. One is matte finish the other is glossy. That makes the AT 80ED quite a bargain if you ask me. Here's a side by side photo of the 2.
The SV80A has a 5-1/8" dew shield but only overhangs the front objective by 3-1/4". The size with the dew shield retracted is actually 18-5/8" with the 1/1/4" adapter installed but no diagonal. 21-1/4" with the dew shield extended.
I didn't see anything in the AT80ED description that mentions it coming with a diagonal. The AT102ED didn't. I don't know what kind of focuser is on the Lunt but the one on my AT102ED very smooth and precise. For $399 this is a fantastic deal.