Aqua casa houseboat, the boat of your dreams! our aqua casa houseboat is the result of years of boat design and building experience. these boats can be built by the. Garwood speedster. it has been said that the 16 foot gar wood speedster is, pound for pound, the most valuable classic production speed boat in the world.. Houseboat rentals. notice: please do not contact us with rental requests for under 6 months. if you are looking for other unique and affordable short-term.