I really don't see an issue with the rooflines. Looks like the angles are fairly similar and the clean lines of both structures should be easy to coordinate, especially in your open, rural setting. Since you've found a stunning deal, I would say, go for it! I definitely would want to find an architect ASAP and by all means, before you pour the slab, make sure you have a plan to coordinate.

Just under the cornice, use same rod height for all openings even though doors are shorter.

Lighting - pendants over the servery bench should be another feature that complements your chosen kitchen surfaces. So whilst I love the copper pendants in picture 1.. They could work depending on the rest of your decor and would be a highlight in a neutral white/timber kitchen = Good! If you choose copper you would complement it with a couple of copper bench top items. These are beautiful! (I collect copper because I love it, my kitchen pendants are silver, I renovated to sell in the next 3-5 years) You will see a picture starting to form in your mind and there is nothing wrong with making a statement with your lighting. I found that when I wasn't sure I would get a very strong sense of what was right and what was wrong for a space, then common sense or passion would determine the outcome! Here are another couple that might work, look her on Houzz under lighting, search pendants, then have fun looking!Timber tones with black or white to complement your cabinets... or Statement white pendants for a bit of quirky fun! Your personality can be reflected in your lighting and accessories creating that point of difference from the predictable white on timber look. Plus don't forget the power of greenery to punctuate the theme!

This is a kitchen going into a dog kennel building so I'm not too worried about resale. My dogs are raw fed and so I spend quite a bit of time prepping food, washing bowls, etc. I'm only 5'6" but I've been doing these tasks in our house... in our current kitchen which has counters at 35 1/2"... and my back is constantly killing me after I get done. I've purchased a long stainless steel counter top for the kennel (with built in sinks) but plan on the cabinets underneath being custom built. Just can't figure out what height. I was wondering... if I'm sitting at a table (which is comfortable for me to work at for hours on end) and I measure where the table top "hits" on my body and then stand and measure the distance to the floor, it's about 41". I'm wondering if that is an indication as to where my counters in the kennel should be! Seems awfully high! I may need to take the counter top I've bought and put it on some saw horses and varying heights and work on it to see what is best before I make the call!