I thought the answers you got on the other site covered it pretty well. If you're just going to sell it, why not leave the cross-members long and give the buyer the option of choosing seat location? Otherwise, you might re-read the suggestions and make a decision. Don't sweat it too much - it can always be changed.
BTW - your work looks pretty nice so far.
Full Size Sail Rig
URCHIN Portable Anchor
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