How to stop pontoon houseboat twisting

by Robert
(Ireland)

rough sketch

rough sketch

I am in the process of building a 12m x3.6m houseboat on 2 Mdpe pontoons the house section will be 7m x 3.5m constructed of SIPs (structural insulated panels). the distance between pontoons is approximately 1.6m. she will be used in local inland lake and river system in Ireland.

I have been told that as she rides over waves she could be prone to racking or twisting between the pontoons which would put a lot of stress on house causing possible damage.

my question is how do i build the frame in such a way that racking will not occur or at least be very minable.

Thanks

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