I purchased standard ends for the X-Axis ends but I have come up with plans as to how to make my own X Axis ends. I really think even the X Axis ends can be made with standard parts and a piece of Plexiglas or aluminum to hold it together. The only tricky part would be the "Nut bracket". That could be made out of Plexiglas. Just drill a 1/2 inch hole in it and then melt the 5/16" nut into the hole.
Here is a picture of my homemade X axis carriage. I had to cut the 1/2 inch pipe supports to fit them in the space available (There is approx 2.05 inches between the rails). The two holes at the back are for mounting the Extruder. The holes at the front already existed but they are for the belt clamps. The center hole was just a little over 1.25 inches in diameter but it was not big enough to lower the hot end down through. I had to disassemble it and reassemble it through the hole. I need to cut off 1/2 inch at the front as it is not needed. I changed the design and moved the holes out 1/8 an inch. Then I countersunk them and used flat head 6-32 screws. Now the print head sits flush.
It is almost done! Just the 25 pin connector at the bottom right and the heatbed to wire up and it will be done. Here is what it looks like at this point.