Well, by know means can I offer a large amount of advice as I am new to the owb world myself. But, things wish I would have considered is a separate ash door with removable pan. I wouldn't have been so concerned about having a huge firebox to put the wood in, as all that has proved to do for me is require me to add more wood to it to keep the boiler hot. Out of all the boilers I checked out, if I had it to do over, I would have went with a Hardy. One, there is a good dealer relatively close by and a friend of mine has had one for 10+ years now and not had a single problem and the design is far superior than mine after I really checked it out. It seems they were so worried about having a huge water capacity or load capacity but more about efficiency of the stove.