415 or 418 - advise from owners please

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   I'll have to post more detailed pictures
I made a birch plywood headboard from ~20mm ply (3/4" in the US)
The foot extension adds 6" (150mm) to the wide end of the v-berth bed.

I carefully cut off the existing edge flush with the surface of the access panels (the ones with the holes in them) that sit over the tank and the bow thruster.

I then built a plywood extension that brings that end out and squares it off with large 4" (100mm) corners.  I used a 4" (100mm) tall piece of plywood to create the new trim edge for the mattress to tuck into, and kerf bent it around the two radius corners.

I used the fabric from the old v-berth cushions to cover the headboard (with some batting to give it a softer feel), and the trim that I made for the foot of the bed.

I considered trying to make the extension flush with the rest of the deck, but decided it wasn't worth it because you wouldn't really feel it through a 8" mattress.  I also added the under-spring setup but left them off of the new raised part, so that took up some of the height difference as well.

I got a new custom mattress made.  It's 8" (200mm) thick memory foam.  The mattress is 60" wide, and 76" long.  It narrows to 33" at the headboard, and has 4" radius corners at the foot.

Edited by SimonGH - 23 July 2022 at 19:52

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SimonGH Members Profile Send Private Message Find Members Posts Add to Buddy List Commander Joined: 08 September 2021 Location: CT Status: Offline Points: 124	Post Options Post Reply Quote SimonGH Report Post Thanks(0) Quote Reply Posted: 23 July 2022 at 19:51
	I'll have to post more detailed pictures I made a birch plywood headboard from ~20mm ply (3/4" in the US) The foot extension adds 6" (150mm) to the wide end of the v-berth bed. I carefully cut off the existing edge flush with the surface of the access panels (the ones with the holes in them) that sit over the tank and the bow thruster. I then built a plywood extension that brings that end out and squares it off with large 4" (100mm) corners. I used a 4" (100mm) tall piece of plywood to create the new trim edge for the mattress to tuck into, and kerf bent it around the two radius corners. I used the fabric from the old v-berth cushions to cover the headboard (with some batting to give it a softer feel), and the trim that I made for the foot of the bed. I considered trying to make the extension flush with the rest of the deck, but decided it wasn't worth it because you wouldn't really feel it through a 8" mattress. I also added the under-spring setup but left them off of the new raised part, so that took up some of the height difference as well. I got a new custom mattress made. It's 8" (200mm) thick memory foam. The mattress is 60" wide, and 76" long. It narrows to 33" at the headboard, and has 4" radius corners at the foot. Edited by SimonGH - 23 July 2022 at 19:52

MJ888 Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 29 July 2025 Location: Toronto Status: Offline Points: 1	Post Options Post Reply Quote MJ888 Report Post Thanks(0) Quote Reply Posted: 29 July 2025 at 21:40
	Hello Simon Thanks so much for sharing this information about how you enlarged the Vberth bed on your 418. I would like to do the same think on my 418. If you could share more detailed pictures that would be much appreciated. If you could show exactly how you extended the foot of the bed it would be helpful. Thanks so much mariot888@gmail.com Mario.



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