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I make long C clamps using some hard plywood. You can do a lot of compression with these extra powerful clamps. It is very useful thanks to its long arms. It is also strong enough to break the board. After downloading the dimensions PDF and watching this video, you can easily make Extra Strong Long C clamps. Adjustable distance very useful.
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PDF Download : Extra Strong Long Reach C-Clamps
Did you see this ? GreenSaw G Clamps
This is the page that contains the desktop jointer's videos. You can view the 3D model video. You can download the PDF plan.

If you want to do a smooth sanding, you need a tool like this. This sanding tool, which looks like a hand plane, will come in handy.