We picked up four 8 'X 1" X 6" pine planks at our local home center. We cut them to the following:

2 - 6'
2 - 2'
2 - 7'
2 - 1'

The bottoms of the 6' and 1' board we will cut a 15 - 30 degree cut so the stand sits at an angle for better light exposure. Choose the angle the frame will be standing at carefully by watching how the light affects the area you want to put this.

From the center of the 7' boards space out 3 3/4" holes with one inch gaps between them. Leave 6" between the last cut and the end of the board for air flow. A little tip is to screw the boards together on top of each other and hole saw through them both at the same time.

I think this picture should be self explanatory enough. Honestly what could I say... screw it together and don’t get your hand between the screw and the wood? Maybe eat some hummus as a snack?

Using the stand as a jig, place the tubes in their respective slots. Place the ends into the tube ends and persuade if needed with a hammer or rubber mallet. Over drive the ends 1/2" extra into the tube leaving a gap. Using some weld on #3 acrylic cement glue the tubes into the tube. Once the glue has cured diagonally drill a 1/8th" hole through the cap and through the side of the tube staying in the cap end the whole time. Fill the hole with thick CA hobby glue and using a 2 1/2" long drywall screw, screw through the cap end and into the wood frame to anchor the tube to the frame. This will also add a lot of structural strength to the frame as well.

Here is a quick shot of all the pumps in place. Note that the protective caps are still on the pumps. Keep them there until your ready to put something in them. Next up in between each of the tubes mount one of the pumps to the top of the frame. If you want you could do it to the bottom instead... but I don’t really care. This is how I did it...