With the Pontoonz DIY concept construction is easy
There are 4-6 basic steps to assemble the hull using main and bow pods.
Assemble the hulls - turn them upside down, join with keel joiner plates and insert a sacrificial keel if wanted.
Join bow pods to boat pods (if using) with a shaped beam
Turn the hulls over and fix transverse beams. (These beams should be cut and drilled away from the plastic pods so that they are not compromised.)
Build the bow as per your design requirements. Decking may extend beyond the bows.
Add the decking and all the other components you want to complete the craft.