18′ proa built by peter schuhmayer in austria ama parts almost ready for stitch and glue – keel and stringers are missing . ama glued and fillets done. [hb18] a compact, multipurpose 16′ houseboat. easy to build in stitch and glue. plans format 2: instant download printed copy and download. units: inches metric.. Plans for the home build. after solid 2 and a half years of work with the hull tha ama work came in 1 i’m working on some stitch and glue designs for an.