I found a guide on making a pin bed and was set on making one. However, the pop rivets I found at Home Depot did not seem very suitable to be the "pins". Those pop rivets' length varied too much. I could do a bit of grinding/trimming to fix the pins, but the idea of doing it to 100+ times was not appealing to me. If anyone have any suggestion to what I can use as pins it would be great.
So I come up with the idea of using aluminum angles to make a panel.
1/2 in. x 96 in. Angle 1/20 in. Thick Aluminum Angle (2 x $6.64)
4-40 Nuts & Bolts (size not critical here)
From the 2 aluminum angles, cut out 11x 10 in. and 4 x 15.5 in aluminum angles.
It is not important if bottom aluminum angles are not perpendicular to the top aluminum angles. What's important is to keep the top aluminum angles parallel to each other. I made some brackets to keep the aluminum angles parallel to each other. Then drill the holes for the bolts. The brackets I made were short so I only did a few rows at a time.
You can use a metal sheet for support instead of using aluminum angles. That way you don't have to do that much drilling. Two bolts at each end would be enough to hold it down. You can use 3 horizontal aluminum angles on the bottom for support instead of 4.