After top width, I needed to make a decision on the side angle. These vary considerably and I couldn't really find a lot of strong data to support one angle over another. The best was perhaps some anecdotal references that a 120° / 60° results in the least amount of attachment (when the bees attach the come to the side).
I have gone with a screened bottom, figuring I can close it later if desired. But generally, I have used open bottoms on Langstroth hives without issue. I do have concerns about proper ventilation in a top bar hive, so this decision was really driven by a desire to ensure I have good ventilation.
I built a stand, roughly based on the beethinking plan, though a tad shorter due to a cutting mistake. I also adjusted the angle to match the sides of my have and just let the hive rest in the open top of the braces. The beethinking design has a cut out that the hive drops down into.
I also built a sloped top cover, similar to the beethinking design. It is a little larger than I would like (too wide ... not sure where I measured wrong), but I suppose that is better than a little too small.
I think the finished product looks nice and will serve well as a decorative hive in a corner of the yard.