That's an ambitious project. There're lots of intersecting roofs and gables, a long front wall which may or may not have to have seams in it depending on what stock you're using and André's capacity. The long canopy roof also falls into this category. What material was the prototype made of. i.e., clapboard, stucco, brick, etc.? The height of the building is also a question. Clapboard siding comes in 6" widths. For walls higher than 6" you will have a seam to design. If you're doing it out of brick or stucco then André can cut the part out of wider Masonite material and you'll have no seam to worry about.
Will you use production windows: Grandt Line, Rusty Stump? Or are you going to design and have André cut them? If you're going to do the latter, perhaps you should have a discussion with André about it before you do your drawing since there are some nuances you need to be aware of. You'll also have to provide roof shingles. I've just ordered the first set of slate-like shingles from Rusty Stumps. The distillery will take four sets. That's $40.00 just for shingles. These projects, even if you design them yourselves are not inexpensive, but they're highly rewarding.
If you use clapboard, the corners are much easier to design and build. You just butt each side to a 3/32" square corner post and glue. This is how Bar Mills does it. Bricks are much harder in every way. They're way harder to draw since there are no O'scale brick-engraved wood sheets from which to cut. You can buy and cut scale millwork clapboard in our scale so you can draw plain walls and specify the clapboard material. Take it from me, designing the bricks will add hours to the drawing time.
Then there's what to do with the brick corners. André butts up his corners and then puts a cover strip on the exposed end grain. I'm using slot and tab construction for strength and alignment, but this now exposes end grain on both edges which must be dealt with. I'm in the process of rethinking how I want to do this going forward. I'm thinking that I'm going to have the cover strips meet in a mitered edge thereby removing any traces of end grain exposure even from the cover strips themselves. Mitering thin 1/16" stock shouldn't be too difficult to do with a piece of sand paper fastened to a flat surface.
The parts that will be really cool are the roof supports. These will come out great when laser cut.
Good luck with the design. If I can be of help let me know and we can work it through private eMail. I'm expecting a finder's fee from André with all this new business I'm getting him 
