I don't know what the placement is on a real MiniSimmons but if it were mine? I'd scrap the twinzer placement and reposition the keels so the rear plugs are about even with where the forward plugs are now. I'd line up the keels where the sidebites are now. I'd also put the sidebite plugs in the rear position... maybe about where the middle keel plugs are now. I'd also wait to see how it rode with the twin/quad layout before adding the weight of a center box. You might not need it.
If the blank if lightweight EPS you might consider adding high density foam inserts at the plug sites or just buy the FCS plugs with the surrounding foam already built in.
would you MAINLY be riding it as a twin keel , firstly ?
I ask , because if it IS to be a quad-mostly setup , you might need to make a second set of much smaller keels [or twin FINS , even?] for the quad option , while still making the keels for the twin keel option , too , perhaps ?
(these are only my thoughts , though ...others will vary , no doubt ?! ... )
my 2 cents,rode a 5.10x23x3,quad.now a 6.0x22.5x3,twin fins,glassed on.much prefer the twin fin for what size wave i use the board on,only up to head high,mostly waist to shoulder,waves that i would longboard with a log…twinnie is looser,and faster if I don’t pump it,just riding the section.if pumping,the quad definitely adds more speed,or feels that way to me.
heres the numbers that I use on my simmons-esque shapes:
trailing edge of keel ~ 4inches up from tail
trailing edge of keel 1 1/4" - 1 1/2" inch from the radius of the rail
keels PARALLEL to stringer (dead straight, no toe! this is important)
no cant (straight up and down)
keels on a simmons should be double foiled and set up like I mentioned above. In my experience toed-in single foiled keels DO NOT work on such a wide planshape. Straight, parallel keels are what gives the shape speed and drive. Your mileage may vary, especially cause you have added a wing.
I'm thinking that one back plug will become TWO , somewhere along the line , as the curiousity of "how would this surf as a THRUSTER ??!! " gets the better of you , Col ?
but , maybe I'm just 'projecting' ?! [ie: I know it would , for ME !]
Yeah maybe u’re right Ben, but I have just two center plugs and one’s for the go pro :)))). the nearest surf shop is about 60-70km so it’s not worth to
Maybe after a while i’ll make another hole for a second center plug .
it’ll definitely surf better than my 6’ x 18’’ x 2 1/4’’ shortboard, whit the summer shity waves we have here.
I’ll make a short movie of my first day with this board.