Telescoping Bed Progress

I have not been able to make too much progress on the bed frame because of shipping issues. The sliding blocks I ordered came in the wrong size, so I had to reorder. I am now awaiting their shipment next week. Additionally, I am still figuring out what to use for my cross beams on the bed frame. I originally was planning on using 8020 because of the ease of assembly with T-nuts. However, the 8020 beams do not have the same size to be screwed into the sliding block hole pattern.

Difference in dimensions between the 8020 beam from Misumi (left) and Vevor sliding block (right)

Obviously, there are some things to re-evaluate at this point in the project. I am beginning to grow concerned about whether I will be able to finish the full assembly of this project while I wait for components to ship. I think I will move to rectangular aluminum tubing for my beams now instead of the 8020, but I am still unsure how to fix these to the Vevor sliding box sliding block seen above. If anyone has any suggestions, it would be greatly appreciated.

For now, my plan is to come up with as detailed of a CAD assembly as possible to better plan out this build. I intend to get everything down to fasteners and brackets, so that I know exactly what I need and how to implement it. Here is my progress so far on the design layout.

Above, you can see what the structure of this build will look like. The two parallel cabinets will be connected with support runners, and then the Vevor sliding rails will run across. Below, I have a rendering of the pillow block attached on top of the sliding rail in more detail. These blocks will be able to slide freely and are what I will be attaching my beams to. I feel confident in my ability to make this foundational part of the design, and I will add more detail to it in the upcoming weeks. I think my plan might shift to get the CAD design fully done and order all materials. From here, I will try to get all the needed cuts done by the end of the semester, but I might not be able to finish assembly. I am okay with this, as this is an ongoing project, and I want to do it right rather than rush to finish without the proper materials. I know I will finish this project, but it might go on past the end of the semester. Another challenge is that, since this is my bed space, I need to do the full assembly in one day or else I won’t have a place to sleep. This is another reason why I want to get all assembly components planned and ready to go. If all materials arrive on time and I am able to finish my cuts, I think I could do the assembly in one full day of work. If this is the case, then I could end up being able to finish by the end of the semester, which would be great.