Hmmm. Putting the springer in the middle is the least useful place to put it, structurally. Right on the neutral plane means it contributes the least to stiffness, and you’ll have the full area of the thing, meaning the most weight.
Thanks for asking,it has been done for a while.Recycled paddle by Benny1.
It is light and strong,but a bit too much surf board and not enough of a boat to SUP.Bamboo-XPS-EPS
Now the compsand drama.
The rocker got over bent in the bag on my first skin. I should have made a rocker table.Put on the rails 2x to get it right.I may still cut the rails off and bring in the wide point.It flexes more than a PU board.
It is fun on small & larger mushy waves.You have to stand up a few seconds before yah think you have got to when the wave gets hollow. I have been knee paddling it.
My lighter more quardinated friends can stand up paddle it.
My kids like it.They picked out the paint pen logo style.