The Keeneroo, if your board suits you, perfect. That's what really counts.
If at any time you plan on redoing your board, have a look at this:
https://www.youtube.com/watch?v=I8UmPnvbc9U
This one repurposes an old surf board, but I have seen them built from scratch, usually less pointy.
Such as this other one:
http://aesneptuno.org/2015/06/15/bri...ncha-pescasub/
However this one is not fiberglassed, which is a BIG mistake. The resin is fragile if not used along textile material (fiberglass or carbon fiber), so the sligthest bump will dent it.
Key search terms for home made / DIY diving board in spanish could be the following:
"Plancha de pesca submarina casera"
"Plancha pescasub"
I hope this helps!