We are in the formative stage of designing a small wood cabin structure that can be transported on a trailer. They are intended to be used as temporary low impact dwellings for landworkers applying for residential permission to live on agricultural land. They will be made for home grown and home sawn timber, primarily larch and spruce; the maximum size will be 2.5m by 12m; they will have a kitchen, shower and composting toilet. They must be movable but we have yet to decide whether this means they will be built onto a chasis on designed to be raised and lowered onto a trailer base. We would be grateful for any advice from those who have also explored this idea.