OK Ron, I've reviewed the kit and let's see if I can make sense of some things. First of all, the HO kit IS pretty much TWO complete buildings. We provided walls with two different types of windows, rectangular and arched. This is one of our earliest kits and we were new to the game and MAY have provided more tabs than you wanted, but what is there makes sense. There is a full tab around the top and bottom and where the sides glue together. You say that the roof is too large. It is not. There is quite a bit of overhang. Look at the cover picture. The roof sticks out a lot. As far as the roof panels, this kits' roof is really cool when done well. YES, there are many extra pieces for you to use any way that you want. BUT, if you start with the basic roof panels, the ones that are fully rectangular, and then layer the partial pieces on top of them, you get a very stiff roof with lots of depth and character. Some of the basic roof sections are at lease 3 layers deep and one, I believe is 5. You also get a couple of different treatments for the gable ends. One thing I do remember about the roof that is probably not as apparent as it should be, is that the 4 pieces that make up the gable and their short connecting sections ARE larger in perimeter than the building walls. You should use scraps of card or even cardboard as shims to space them out from the walls appropriately. I know that this is a lot to absorb, but put the walls together to get the basic building square, I would use a sheet of scrap to make a bottom stiffener and glue it to those bottom tabs, which fold in. Next build the roof gable and sides so you can see how much bigger than the walls that it is. Fill the gap with filler strips laminated till you get it all square. Overlap the bottom edge of the gable JUST SLIGHTLY over the top edge of the walls. I think everything else is pretty simple from there.
Good luck. Call if you need more help.

Hi guys. I'm glad things have straightened themselves out. I must apologize. After looking at the kit A SECOND TIME, this time with my glasses on, I see what you mean about extra tabs. We put that kit out a long time ago and while I WANT to say that "we were just allowing you to be creative and give you TAB OPTIONS", I think that we just didn't know what we were doing back them. Sorry for the confusion, but again, as always, our customers are the brightest and most creative on the planet. WELL DONE.