Sorry to hear about your bicep, I hope your recovery is swift!
I really appreciate the feedback. Currently you can create T or + hallways. I figured people would use the doors themselves to create an L, or corner, but I can see the desire for regular walls. I can most likely address that in a future update with some additional pieces. I already have one planned for early next year that I will try to slip this into. As for the angled/elbowed hallways I will have to see if I can implement that into the existing design. Again, thank you for this valuable feedback. =)