If you have a dremel or a chisel or some other way to cut a groove right down the middle of it you might be able to get it out with a flat head screwdriver.

It’s rusted enough that it might be possible to just break off the head with a chisel. 🤷🏻‍♀️ I’ll soak it in some WD40 and play around with it a bit before I start buying new tools. Thanks everyone!

Are you sure that it is impossible to reduce the head with a file and make it convenient to grab with another key?

Is it possible to buy a bolt extractor? There are internal and external.

Channel locks for pipes or even a pipe wrench

You could add material to the head. Such as like some sort of cloth or screen material that would wrap around the bolt head & make the wrench snug up far better.

Thanks for ideas! The location in the corner makes it hard to get the right angle with anything to cut it off. I’m not sure if I can get a photo to post: https://www.dropbox.com/s/k3838ovrlkdsc5s/IMG_1162.HEIC?dl=0

try grabbing it with a vice-grip pilers. However soak the threaded part in some rusted bolt release agent.

Weld a bar to it, soak it in your favourite anti-seize, have a coffee break and give the bar a few sharp taps with a hammer in an anti-clockwise direction. Sharp taps can help shock it loose if it's nightmare tight.

I'd try to cut the bolt head off with one of these multi-tools. That first blade, (on the left) is a knife blade to cut under the bolt head.

Hacksaw.

P-trap is too low. Water has to stand up way above the trap before reaching the single outlet on the wall. Which means you'll never be able to take the trap apart without dumping a lot of excess water

I'd have two traps because I don't want to smell that horizontal section full of food scraps & grease

And would it be too late to build your under cabinet like a shower stall, complete with floor drain & overhead work light?

No, but I take that as a huge compliment. Our first and now second house have both been fixer uppers. Lots of nights and weekends fixing or watching YouTube’s. Plumbing is something I actually really enjoy (I think it’s all the pieces so it’s like adult legos). I hate electrical though - I have large hands and just fumble with the wires.

Handyman I assume?

Ah, right on. Maybe it's under a different name but poke around the Ikea site in case. Best of luck.

I just looked it up, doesn’t appear to be in the AUstore, but might be able to it off eBay. I think this might be the perfect solution.

Ikea sells I believe. You have to ask for it or know what you are looking for - think it's called TRILLINGEN?

Take a piece of wood the same thickness. Mark 2" on your line of cut on top of the board. Cut to the mark. Remove board, flip over and use a square to transfer the end of the kerf to the edge of the board. Do the same with the original 2" mark on top. The distance between the two lines is what you need to hold the top cut back by.

i.e. if the bottom kerf is 2 1/2" you would stop cutting 1/2" before the end. Then finish up with jig saw or whatever.

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IRC section 311.7.11 have a read through that.

Brad nails are a monstorous no in this construction. If it’s all of solid wood lean toward white oak or at the least Douglas fir. Through bolt the treads by extending them back to overlap the stringers OR create triangle wedges that are bolted to stringers then downward fasten treads through and plug holes.

There are other suggestions on cutting I’d recommend the table saw undercut and then Japanese hand saw or standard very sharp handsaw to finish. Cutting all this is the easy part the assembly is what will take a long time.

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So you’re making an alternating tread stair case?

Agree with the advice you have so far. You don't give dimensions but that angled cut is definitely going to be more than a 10" blade can give you. Maybe the short cut that joins it is possible with a 10"? I've built jigs for this kind of cut before. You need a solid one to hold a stair tread firmly and vertical.

I see no problem with finishing the cut with a jigsaw with a fresh blade and then taking a wide chisel to clean it up.

If you watch woodworking videos you'll see that no matter how well equipped someone's shop is, they're always pulling out a chisel to clean up a mortise, shoulder cut, or whatever. Chisel skills put you at the next level woodworking wise.

I guess you could but a circular saw with a good blade will work just as good. Not sure what is going on with the steps design but be careful when using

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How are you going to attach them to your stringers?