I drilled 4 holes in the front lower half sheet of MDF for my arm access ports. I am using 6” swage couplers for this. The holes are not 6 inches of course, they are almost 6 ¾ inches across. Must be due to the fact that the sewage pipe is 6” inside and ¼” thick wall, and the wall of the coupling is just over ¼” itself. But all I did was place one of the cut pieces and trace around it. After I used my jigsaw to cut the holes, then I used a file to get the ruff edges of the holes rounded out. I then used a small sheet of 36 grit sandpaper to finish them. They fit nice and snug. I will have to use Liquid Nails to act as a calking and to keep them in place. Now I was ready to install both upper and lower front sheets to the cabinet. I drilled and counter sunk all the screw holes. I used lots of Liquid Nails around the frame where the panels where to contact the frame. After I lined up and screwed down the sheets I cleaned up the extra Liquid Nails from around the edges. I had a problem. I noticed that when I put in the 6” couplers that there was no room between them and one of the cabinets frame cross members. I needed about a half inch of clearance so that it can clear the glove and pipe clamp that is to go around the couplers. I simply took my saws-all and cut notches in the cross member. Here are the pictures.
