Hi I've been assembling my first two hives when I noticed a few things

I don't have a lot of tools besides my hammer, a carpenter square and nails- does it matter if the box isn't perfectly 90 degree angles so that it perfectly sits on top of another? I'm noticing very slight deviations between the boxes when I sit them on top of each other. I was thinking it wouldn't matter anyway once it gets propolis on it.

Also, I'm surprised I'd never heard any discussion on this but I just noticed my plastic foundation doesn't completely cover the inside of my frames- there's a vertical space gap on the side. I figured that this is on purpose to act as a communication hole. How do you align your gap? I was wondering if I should alternate the gaps with every frame or keep the gap on the same side for each.