Hi guys, to anyone that's interested I thought I'd share what I've been up to in the workshop today. My arms, hands, and fingers are well and truly suffering now but I'm pleased with the finished result.
I've completed my plunger solo seat pan today after hours of hammering 3mm cold rolled steel. Hard work

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Firstly, I made a paper sketch, cut it out and transfered it onto the steel sheet. I then used the jigsaw to cut it out. I smoothed the edges with a flexible disk in the angle grinder. Next is shaping. last week i decided to treat myself to a beating sandbag after wanting one for absolutely ages. I waited a few days for it to turn up so I didn't get round to shaping until today.
Here's the sequence: