You have always wanted a Sea-Do or other sport boat but $15,000 is just to steep. What ever you can do on one of them, you can do on this little guy. A modern 10 hp outboard is small enough and powerful enough to give you big thrills on this mini, and your fuel consumption won't break the bank.
You will recall, I mentioned seeing this plan in Popular Mechanics, it was also published in "Junior Mechanics Handbook" published by ARCO Publishing in 1964. This plan scan is from that book.
With winter coming on, why am I posting these now? Because if you want to enjoy warm summer fun on the water, you have to build your creations in the cold snowy winter, lol.
If your like me, you like to combine the best features of multiple plans, to make your own creation.
Here is the link to the Hydro-Cart post.