Thanks Christopher_H - i just posted on home decorating forum.

Check out Dimplex.com, they have many electric fireplace units as well as many fireboxes to choose from and mount on the wall. You can most likely find a local dealer to see in person. We recently had a custom light natural maple credenza made from an Amish company and had a Dimplex firebox installed in it. It needs no special venting because the hot air blows out the front into the room but it does require a separate line due to the heat fan (if you don't use the heat fan, then maybe you won't need the separate line). We have clear glass beads on the bottom of the firebox and it is essentially an LED light show! We actually have a wall mount firebox installed in a piece of furniture. http://dimplex.com/en/fireplaces/wallmounts We never thought we'd use the heat element, but we have used it once or twice and it works great. Honestly, we are so happy with our finished product, decorating our FL condo is still a work in progress, but here is what we have so far. I know its not really what you're looking for, but just an FYI. I wish the pic would show off the flame/lights as they really look, we think they're beautiful.

So you'll want a console in the 70-80" range. The white one is 74". I just found this one on Houzz. You can likely find something similar for cheaper elsewhere. [https://www.houzz.com/products/74-entertainment-console-p610e-74-prvw-vr~76219418[(https://www.houzz.com/products/74-entertainment-console-p610e-74-prvw-vr~76219418) Here is is from Wayfair: https://www.wayfair.com/August-Grove-Willow-74-TV-Stand-ATGR3016-L6-K~ATGR3016.html?refid=GX103455957163-ATGR3016_16392810&device=c&ptid=304248958284&targetid=pla-304248958284&PiID%5B%5D=16392810&gclid=Cj0KCQiAvrfSBRC2ARIsAFumcm9Z5rS4F5DFIunO07FJwgKqgN6dUv1EPoOt_4vCPu3vm2HzE1mPKLwaAqn6EALw_wcB&piid=16392810

OK so if you keep the wall unit and enlarge the screen you'll need to adjust the assembly of items so that the overall appearance is larger and more proportioned to the wall. Here I show the larger screen and a series of 4 coordinated wall objects.