This is a small cabin boat that sleeps 1 person with lots of space and great to have for kids to play in even in the swimming pool.
The total cost was about $300. The price can vary if you decide to use more expensive materials. (Ex: thicker plywood)

Here are the materials used: (Note: an apostrophe  (') denotes "foot" and quotation marks (") denote inches
4' X 8' Plywood Any thickness - 6
2" X 4" X 8' Lumber - 17 (This includes extras in case you mess up)
2" X 4" X 10' Lumber - 2
1 ¼ (1.25)" Exterior Screws - 2lbs
2 ½ (2.5)" Exterior Screws - 2lbs
3" X 6" Mending Plates - 40
2" X 4" Mending Plates - 6
Clear Silicone Caulk - 3 Tubes
Fiber Glass Sheeting and Resin - min. 150 sq. feet

You will also need:
Drill bits for the screw head you decide
Drill bit (about 1/8")
Caulk Gun
Circular Saw
Jig Saw (for angle cuts on bow)

Step 1: Organize and Make Cuts

Create 5, letter-named lumber pieces. (A, B, C, D, and E)
A - 4'  B - 3' 5"  C - 4' 2 ¼ (2.25)"  D - 17 5/8 (17.625)"  E - 1' 6" (1.5')
Note: Use the 2" X 4" X 8' lumber for the A, B, and D pieces and the 2" X 4" X 10' for the C and E pieces

You will need 10 A pieces, 11 B pieces, 3 C pieces, 16 D pieces, and 3 E pieces

Measure from the top of all E pieces a 25° angle. 3¾ inches in from the side of the E piece, draw another angle at 70°. These pieces will make p the top part of the bow. Attached is a picture. Erase the lines not shown in the picture and use the jigsaw to cut along the remaining lines.

On all three C pieces, draw a 45° angle from the top. Then on the other end, draw a 20° angle from the top to form a trapezoid. On one C piece, draw a 70° angle from the top 3¾" from the end where you drew the 20° angle. (Refer to picture.) Erase lines not seen in picture and cut with jigsaw along the remaining lines.

<p>-----this insanity has been up for over FOUR YEARS! Apparently, Instructables is safe from litigation, or at least they believe they are.</p>
<p>I can't believe this is intended to be put in WATER! Please remove this dangerous thing before it KILLS someone.</p>
<p><a href="https://www.instructables.com/member/ChiBlackhawksFan/" rel="nofollow"><strong>ChiBlackhawksFan</strong></a>0 seconds ago<a rel="nofollow">Reply</a></p><p>As several others have posted this does not look like it is seaworthy. Since it is top heavy it may roll over on its side or even all the way over with someone bouncing around inside. In shallow water, such as a pool or near the edge of a lake, it could end up upside down and make it impossible to open the trap door in order to escape. The bottom line is that this looks very dangerous and I recommend taking this article down. Also to consider is that there is no propulsion system or way to mount one and if you modified the design to include a motor mount you would be unable to see where you are going to steer the vessel so all you can do is float around. Sorry to be critical as the person who posted this spent a lot of time and i'm sure had good intentions but I dont want anyone to get hurt or worse....</p><p>I would like to encourage the original poster to have another go at it with a non-enclosed design such as a rowboat, kayak, skiff, etc.</p>
Hmmmmmmm, well....your CAD skills are pretty sweet, no doubt!! I'm just not too sure about this...........I just don't think this would be too stable.
I must say, I enjoy the idea of this. But like l8nite said, wouldn't this be top heavy? Would outriggers be something to consider? I feel like it might sink with a 150lbs person inside. The spear house we made this year has similar properties and it ways a few hundred pounds. So this has to weigh at lease 150-250. Another issue would be navigation. How would you move this around in the water? It'd be nearly impossible and any wind would reck you on the shore or flip you over. All in all, I like the time you put into this and the CAD pictures/diagrams you made. With a little work and a little bit different design. This could work very well.
interesting build conccept.<br><br>how heavy is the finished product?<br><br>have you tested it out in water yet?<br>
looks super heavy for its size and unstable/top heavy as well, nicely planned out &quot;ible&quot; however. Thank you for sharing
doesn't look very seaworthy X3

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