Geez!
This is challenging, wow.

Okay so, sanded the neck down and its looking good. A slight 2mm gap but i'll deal with it.

I tried doing a mock build BUT the posts dont seem to fit in the holes without tape, so no chance of it going in with tape.

Either way, tried to somehow get an idea if the neck was straight but holding the bridge with one hand while the strings were in their places (this was near impossible with a bigsby, loose neck, loose strings, etc.) so I'm sort of just going with it.

Im guessing from here it might be best to drill the holes in first? that way I can mark up the body with no worries about damaging the finish? yeah or nah...

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Another thing, I'm getting to the stage where I should probably check the neck with a straight edge according to the guide. I don't have one handy and I'm not sure if its worth buying one for a one off guitar build - any savvy DIY way around this?

For now, i'm going to crack open a beverage and walk away from the very small work bench I am using hahaha