I think power “ratings” are regional and probably a bit personal too!
I can assure that IMO 12 foot stacers perform just about right with a 30 2st . 40hp was a little hard to control but 30 is just right!
a 4.2 for mine will be wanting with a 30 once you’ve got it loaded up - the 70 was a bit tongue in cheek but I ran a rude 50 on a 3.9 for many years and it was powered about right. Many years ago one of the outer island lads won the Prince of Wales challenge in the Torres running a 4.2 quinny and modified merc 90 on the tiller… that thing proper flew.
At least mild steel rusts and leaves the ally mostly ok unlike stainless !!!
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