My home made long board sanders were lengths of grey foam pipe lagging cut in half to leave a flat side for the paper and the curved bit to grip.
You can cut these to whatever lengths you want, the curved bit is comfortable to hold, it is very cheap and has enough flex in its length to cope with the curves of the bodywork
I made mine about 12" long and they cut the seams down to size quickly and easily with a length if 80 grit on them
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