NSP mini tuttle fin boxes are around 9cm long x 1.8 cm high x 1.3cm wide
If somebody has the blueprints+ dimensions, pls post here.
The Mini-Tuttle foilboard struts plug can be casted in one of the mini tuttle boxes as described bellow.
Here is my favorite link from Reystos.about Tuttle box.
(From the legendary http://www.geocities.ws/reystos/ and his SW for designing kites - some 12 years ago)
Although I cannot guarantee the results of this method, you can use a finbox to cast the base. This applies to Powerbox and Tuttle (+Deep Tuttle) fins. Trimbox fins can't be cast in their box as the box doesn't have the fin's shape. Make sure your finbox is waxed well and the screw holes are sealed with plasticine before casting with thickened resin or epoxy putty. You will also have to figure out a way to keep your fin vertical in respect to the level of the finbox. Another detail you will need to figure out is how to place the screw nuts in position, since casting with the screws in place is no easy task.
Fin designer still available here: http://www.geocities.ws/reystos/fin_designer/index.html
I cannot open the Zip archive (old Win 95/98/ME Zip version not compatible xith Win VISTA, 7 Zip ? 32bit vs 64bit ??)
For our 100 or 110 mm chords, the 160mm box will clearly be over dimensionned.
3G composites (Ketos by Orana) have developped their own box based on morse cone sections around 5 degrees (versus 6 for the tuttle box wall).
AlpineFoil use this setup on the 5.0 board version with the Courtesy of 3G composites.