They can do 45 deg angles. Legs are eight sided where the cross pieces are attached so that is not a problem. I don't know about other angles though. The 36" legs should be no problem for them either. It's all able to be pretty much customized and they give you detailed, color coded plans to make it all go together easily. They supply really nice drawings with your order.
You can email Tim your plans too, I did that with one of mine. I' m sure he will fix you up with something. This might be a busy time for him though, he goes to York, I think, so has to get all that ready, etc. My first order came really quickly, but my second order was around this time of year and York and it took a fair bit longer.
Some think the cost is high for the Mianne, but it was worth every penny to me. Easy, fast and no mess, I think it looks really nice too. Had HD cut all the plywood into smaller pieces and that was also very easy. It'a also very easy to modify if you want to make any changes down the road (like where I am now). I have some health/physical issues and I can't do what I used to, so that made it all the more attractive to me. I am a big fan!
Hmmm...you've got me thinking about an around the room layout again now after looking at your plan...
Good luck and if you have any more questions I can help with, ask away!
