It can be built in one day, but I don't think I could do it , and carry two people, if they are small , and can support 900 lbs. Weighing in at about 70 lbs. Power plant can be anything from a 5 to 15 HP but a 20 HP has been used with great results. More info will be added as fast as I get it.
Any comments are welcome.
Playing around does have it's risks and your on your own.