No, rotation is impossible. I don't know how to do it in this game
Nice work like the inside even more.
For blueprints use these:
With BP in hand Left click mouse to enter position mode then
1) Arrow keys to move BP on all it's axis X-Y-Z ( planks n beams ) ( if standard blocks have been used may not work)
2) pg up / pg down to move it up&down
3) Shift + arrow keys to rotate it
4) Press enter ( before placing ) to view BP in solid or transparent form