I get this idea, and this is indeed a possibility. But i am afraid i just won't trust such an extension if it is not welded on with an electric bike. It is going to be a heavy and fast machine, so i need to make sure there would be no play possible anywhere.You can use the shockmaster without damaging it. Make a set of extensions that will give the front axle the extra 2 inches forward it needs. You could also add some height and get the angle of the frame just right.
The horizontal support would be provided by bolting them to the existing drops and the vertical support would be supported by folded tabs made into the extensions which use the main fork legs for bracing. The tabs could be on both front and back sides of the fork legs or just the front, as that is where the force will be applied when there's weight on the fork. You wouldn't need extra braces.
The shape of the added dropouts could be in keeping with the lines of the bike.
I have limited skills on graphics, but here's the idea. The red line is where the tab would sit up against the fork. Of course the shape of the extension would be different than my crude depiction, but it would work.
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I will sand them a bit on the surfaces and edges, but i am not planning to dull the peaks. If they melt - so be it The plate is quite thick though, so i suppose there is a chance it won't. I could also reduce the power closer to the tip, there would be enough surface contact for sure.Mmmmmmniammm....
Will you be clipping the pointy bits off the top of the spades before welding them on, in case they melt during welding, or do you have another plan? I miss having welding kit around.