I love how light and airy this one bed houseboat is by the company ecofloatinghomes.A roof garden is an awesome idea and a great use of space.I'd want a two bedroomed one though so I'd have a half floor with a bedroom on top and a smaller garden area.Then I could add solar panels which wouldn't be that visible.
Anchoring. Choosing the type and size of anchors and cable to carry aboard will depend on the type and size of your vessel and the sea area it is being used in. Most importantly, choose anchors that are big enough for your vessel and those which are recommended by the manufacturers. Cruising yachts normally carry at least two types of anchor, plus suitable lengths of chain and rope cables.