everything fits better when you build it inside the car using every inch possible loli did it once.
built a box 36 x 18 but couldnt fit it in the trunk
luckily i was test fiting it before it was all built...was able to trim it down..
then threw it away and built a wall.
but 25% is either from bad cuts or bad measurements.
You really mess up that often? Sounds like a lot of wasted money in MDF. I think the only box I've messed up is when I was trying to stack a couple on top of each other to do a "wall" with 4 18's...just barely wouldn't fit. Other than that, ~30 boxes with maybe a few cuts that I messed up because I was 3/4" off on my cut list.all 4 boxes I have built, I've had to modify the plans while building, because ive messed up something