I'm trying to desing a pontoon based houseboat. Would appreciate advice on several topics.<br />General plan: 8'x36 foot on land expanding to 14'x36' on water. Cabin 7'7" x 24 '. Cabin should weigh 2800 lbs. Total live load expected to be 4500 lbs inc. cabin, pontoons, motor etc.<br /><br />What size pontoons 17" or 26" ?<br />What Size motor? <br /><br />Thanks for any and all help.