FYI Kingy.
Rear inspection ports on 1827 are offset (to the outer gunwale) with a single central stringer (12mm x 10mm), in the vertical orientation. I inserted 5" ports compared to 4" on 1765. I ensured there was sufficient space between the gunwale and the stringer as the latter was fitted. With the larger holes and their offset the ease of access is incredible. I have no issue with trapping on the transom, even with the inspection ports' location. Trust Photos tell the story.



The extra ply ring is planed flattish, thinned to zero in the middle, to reduce the curvature impacted on the plastic ring and improves tightening,sealing and removal.



Main beam inspection port, offset also.