Further filling of the underside of the tank has also been done this week. This is going to take a long time because a) the convoluted shape means that power sanding tools cannot be used easily and b) I am concerned there is not enough clearance between the front seat support on the frame and the bottom of the tank. Also I discovered that to get the tank off it has to be tilted backwards and the act of tilting it causes other clearance problems at the front. Unfortunately I think I need to remove about 8mm from the section where it is plywood laminated about 50mm deep and I cannot get any sort of saw in there without threatening the nicely sanded top surface.
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