Internet is being a right pain..Sky broadband..your doing my head right in and spoiling my posting
I have to write this in Microsoft word first as I keep losing the work I’ve just done..grrr..
Here is another view…

I marked everything up and got to work on the first plate

Tools and my best friend my workmate.

First plate being sorted..cup of tea and tufcut..not together might I add..

A closer look at the m12 tapping bit and my first bolt…yes boy..

First plate fitted..x5 bolts used as you can see..

All bolts backed up with a washer and nyloc nut underneath..proper job

Second plate fitted again x5 bolts used.. I’m flying now, becoming an expert..whoop..

Third and final plate..I went for x4 bolts as I felt this would be adequate

I then got the seat and placed it on ..re measures the 240mm and used a punch to mark the seat holes..I wasn’t able to get the drill in there!...I drilled them and again tapped out m12 bolt holes.

And finally I fitted the seat..I have to say I’m rather chuffed..solid and I feel really confident My nippers will be safe sitting/travelling in these..

A look at the bolts from a different angle..

And from the back..you will notice x2 bolts have several washers (x4 extra)..I had to use m12x60 here because of the trough in the floor panel. When I initialy bolted underneath I couldn’t get them tight enough and ended up tightening up to the bolt shoulder. Adding the washers up top help me get the thread I needed. M12x20 were not long enough and I didn’t want to deform the steel plate if I did decide to use them.

All thats left to do is get some washers and nyloc the seat bolts up...job done and well chuffed..my nippers had a test sit sit and wanted to know when we were off to the beach!!...I feel confident the job I've done will be sound for my nippers travelling around. I sat in them and fastened the belts and rock to a fro quite sharply...hope the neighbours weren't watching..did look a little bit like I was into licking windows and stuff
Thanks for looking and as ever your support, feedback is always appreciated. Once again...thanks Frag for sorting me out with the seat belt anchor..spot on.
Catch you all soon
Tom