I have a 20' cabin mod . glued a 6" keel on with west epoxy , glued 30" rolling chocks on each side also, slowed the roll a little but its a lite narrow boat .
dont have any pics can take some in dec when i haul it
I dont think it slowed the speed down much , steers better , slowed the roll a little . wasnt much effort . cove the 2x6 to match the existing keel , mix epoxy (slow) thickened with cabasil ,wedge it up from the trailer and let it dry .
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the reason I did this was to stop swinging at anchor . with more wind surface than wet resistance it would swing when fishing in rockey bottom which equals a lot of lost tackle . I just put the chocks on this year and I have not bottom fished yet . the keel didnt offfer much help