You need a plate on the rear of the kayak to mount the motor to. From what I can tell looking at your pictures above it looks like you have 3 screws at the rear of the kayak maybe 4. Looks like there’s either 1 or 2 for the rear handle and one on each side for the bungee. You could cut out a 1/2” hdpp plate the shape of the rear of the kayak and use those screws as mounting points for the plate. Just make a template out of cardboard first then trace it in to the hdpp. You can buy the hdpp on Amazon.

Here’s a video of a similar install.

https://youtu.be/s-EdNPWvDbs

On the foot peg screws sounds like they are stripped. This can happen easily if they were over tighten. Get a small flat head screwdriver and slide it between the plastic foot peg rail (or whatever the screw is holding) and push away on the screwdriver as if you are trying to pry the rail off. Then slowly turn the screw with as little pressure as possible and it should come out.

Can you post a pic of the screw head for the handle? Ive seen hex head screws used a lot on kayaks.

Either way a bit set with a variety of bits will come in handy. I found a good one at Harbor Freight for a few bucks.

What is this called, new sheriff in town head?

Once you get that screw out I would take it to a hardware store and determine what thread type it is and find a screw with a hex head and same thread type to replace it with.

Now I have to cut board to fit over back of stern, make holes where old holes are and make hole that lets me still access drain plug.. what’s the chances of me getting that right the first try? thinking about loading up and going fishing instead of getting frustrated..

I’m not looking forward to assembling this either