I have now welded the second side of the frame. I clamped it to the other side to get it flat etc:

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I then tacked it together and welded the horizontal joins ... then rotated it and did the same etc:

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My welding is getting much more consistent. Still probably should have chosen something simpler for my first welding project!

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Now I have positioned the remaining pieces to work out how to proceed:

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I decided to use some spacers from steel tube. I'll put a few more in and use them to clamp the in between pieces. Cats were interested...

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Any comments / ideas welcome.