"The first problem you’ll encounter is that cutting your 2x12s to the right angle is a bit complicated because there’s no obvious way to trace the correct angle

"The first problem you’ll encounter is that cutting your 2x12s to the right angle is a bit complicated because there’s no obvious way to trace the correct angles." Rubbish or as we say here: bollocks. Chippies have been doing first fit for centuries. Its lovely that someone is discovering how wood and homes work. All power to you. Tomorrow - bricks?