Vaporcat 6.1m DIY Aluminium Kitset

If you are handy with a welder and up for a challenge the VC 6.1 might be just the project you are looking for.

This isn’t another fragile, overcomplicated project hull. It’s a purpose-built offshore platform designed to perform properly when conditions turn ugly.

At 6.1m x 2.4m, this cat delivers the ride quality multihulls are known for—soft re-entry, reduced roll, and predictable handling offshore. The inherent stability of the twin hull form keeps the boat level at rest and composed underway, while the self-draining deck eliminates the risk of water accumulation. It’s a platform that forgives mistakes instead of punishing them.

Rated for a single 175–300hp outboard, it has the power range to suit anything from efficient cruising setups to high-performance builds. Tow weight sits around 2300kg, keeping it within reach of a typical dual-cab ute—no oversized tow rig required.

The real differentiator is the build approach. This kit has been engineered specifically for accessibility. Structural components are simplified, alignment is controlled, and the build sequence removes the usual guesswork. Less experienced builders can achieve a professional result without needing to be a seasoned fabricator. It lowers the barrier to entry without dumbing down the outcome.

End result: a genuine offshore-capable aluminium catamaran at a fraction of the cost of a finished boat. No compromises on safety, no gimmicks—just a solid, practical design that works.

This is the most direct path to owning a serious offshore vessel without handing over six figures for someone else’s labour.

Full assembly drawings, parts lists and CNC cut part parts are supplied.