George,With the exception of the swing out table built from the 8020 Quick Frame extrusions all other extrusions are 15” series – 1.5" in multiple profiles. All of my modules are primarily attached to the floor (except overhead cabinets) so for crash proof design I picked 1.5”. The complete frame strength is related to beams strengths but also to t-slot attachments/joints strength. At some points I used double attachments, such as internal angle and an end connector. The strength of 15 series joints is considerably stronger than 10 series joints. For overhead cabinets I used anchors, the strongest fastener, in order to keep the assembly very strong, I explained why in an earlier post.
I completely relied on the strength of 8020 frames, my fill panels are floating and not provide any strength, in the back side of cabinets I don’t have any fillers. If you would choose to use filler panels for added strength than likely 1” extrusion would be OK, I considered this type of the design but did not like the aesthetics of external bolts and exposed edges, but I am sure it can be done. If you plan to use floor and walls to attached your cabinets than 1” could be sufficient.
Dave coached me earlier that it is much easier to work with one size profile versus multiple sizes to keep your fasteners, bolts, nuts inventory reasonably simple to manage, I absolutely agree.
I agree with you, one size fits all is much simpler, specially when you don;t have local access to the hardware like me.
I have all the pics form your build and I need to plan the 80/20 over my layout (Westfalia or Orangecamp inspired)
I saw the high cabinets you did, but my wife doesn't want sliding doors, she wants hinged doors, I think you did say that you would prefer that too.
One question I have is, how did you anchor the trusts to the floor? Nuts and bolts? this is aluminum and you don't want any galvanic corrosion with the body steel.
My floor is insulated with 1' styrofoam + plywood and linoleum.
Many thanks again!