Hi Joyce,
Here are the main materials I used. Got them all from Tap plastics.
1. weld-on #16 cement
2. have them cut you a 4"x6" 3/8" thick acrylic for the door
3 acrylic box/container 4x6"
4. 30" long 3/4" acrylic tube -- for feeding.
5. I used this for the door slider/track see if you can have them cut it for you 2 piece of 6" lenght.
6. 2"x2" 1/4" thick white acrylic or plastic and have them drip a 3/4" hole in the middle. I used this to spot where the hole is in the box when I insert the feeding tube.
7. two pieces of 1/2" by 4". You'll use this a stopper so that when you pull the door open does not come off its slider/track.