Multihull plans for home builders
Build your own multihull.
K-designs has developed catamarans, trimarans, proas, power cats and unconventional multihulls for amateur construction since 1980.
Designed to be built.
Practical wood/epoxy/glass composite construction, normal workshop tools and direct designer support.
Since 1980
Multihull design for home builders
Multihull design for home builders
Designs based on practical experience
The aim is simple: strong, light and economical multihulls that ordinary builders can actually construct and use.
The aim is simple: strong, light and economical multihulls that ordinary builders can actually construct and use.
15 boats built
Hands-on building experience
Hands-on building experience
11 years aboard
~900 members
Can you repair a chair?
Then you already have many of the basic skills needed to build one of these boats. Ordinary woodworking tools are sufficient for most construction work.
The designs are supported by direct contact with the designer and by the K-designs builder community.
Then you already have many of the basic skills needed to build one of these boats. Ordinary woodworking tools are sufficient for most construction work.
The designs are supported by direct contact with the designer and by the K-designs builder community.
Design philosophy
My portfolio ranges from very small multihulls to cruising cats, houseboats and experimental craft. Many are intentionally unconventional and designed for owners who want something different from a production boat.
Home-built designs continue to use the time-proven wood/epoxy/glass composite method. It keeps weight and cost under control while remaining suitable for amateur construction.
My portfolio ranges from very small multihulls to cruising cats, houseboats and experimental craft. Many are intentionally unconventional and designed for owners who want something different from a production boat.
Home-built designs continue to use the time-proven wood/epoxy/glass composite method. It keeps weight and cost under control while remaining suitable for amateur construction.
Design portfolio
Choose a design
Click a design for more information. The page is arranged as a clean catalogue so visitors can compare boats quickly.
Small boats Cruiser / racers Power & houseboats Experimental
ECO520
Little Tri
DUO 425
Tiny Tri
SC 435
CATA PROA
DUO 480
DUO 480 cabin
ECO 550 power
ECO 550 sail
ECO62 H
ECO 600
Houseboat 7,5m
KD 1000
KD 105
MANTA
KD 122 Voyager
MAXI
PELICAN
KD 650
DUO 800 assym.
ECO 75 sail
ECO75 power
DUO 800 symm
KD850
P95
KD 850 oben
DUO 900
ECO 6 P
Wing in ground-effect craft
K-designs
Multihull designs for home construction
Copyright © 2026 B. Kohler, K-designs · All rights reserved
Multihull designs for home construction
Copyright © 2026 B. Kohler, K-designs · All rights reserved
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