I'll be glad to. there are several reasons that I opted to do it this way. first, I was not able to find a ready dome lid as many of the members are using, so, I was looking for an alternative and I found it (or so I hope) in making a UDS with a side opening. I think that it has the advantage that it decreases the temperature drop when opened. since the heat's tendency is to move up, when you open the lead of the "conventional" UDS. it's easier for the hot air inside to go out, so with a side door, the temperature drop is lower. (at least, that's the theory).