Guitar amp tilt stand - easy as lincoln logs. small, portable, simple, stable, cheap or free using scrap plywood. Great for combo amps, larger design can be used for open backs.

Step 1: Did I Say Small and Portable?

small and portable.

Step 2: Did I Mention Easy?

Cut 4 pieces of plywood about like this. I used 1/2" plywood. The slots should slide together easily, but not too loose or the stand will tilt side-to-side.
Keep it low to the ground, or it will tilt also.
It occurred to me later that because both cross-braces slide in horizontally, it's less stable, and can cause some side-to-side tilting. More stability could be achieved by making one slide in up and down, perpendicular to the other, instead of parallel . Then you could build it taller if you wanted to.
If you use thicker plywood, with good fitting slots, it will be very stable and you can build it higher off the ground.

Step 3: More Stable Design?

I didn't actually build this, I just doctored the photo. This should produce a very stable stand with no side to side tilting. Notice that with the amp sitting on the stand, it's impossible for the slats to come out.
Just so you know, I flunked woodshop in Jr. High 'cause I don't like sanding.

Step 4: Did I Say Easy to Construct?

Did I say easy to construct? No, I don't think I actually said that, but it is. Slide pieces together like lincoln logs. Small footprint, but strong and stable.

Step 5: Step 4 - Place Amp in Stand.

That's about the size of it.

Step 6: For Open Back or Large Cabinets, Make the Back Part Larger.

For open back or large cabinets, make the back part larger, and the cross pieces longer to make a wider base. This means it's not as portable, but it's still pretty good.

Step 7: Add a Shelf

Add a Shelf... When tilting an amp, I lose the nice flat space on the top of the amp (for tuners, harmonicas, etc.).
To add shelves, I made the cross brace pieces larger.

Step 8: Assemble Like This.

Assembled together it looks sorta like this.

Step 9: Just Add Amp.

With front and back shelf space. This takes up more area on stage, so not practical sometimes. (we know how valuable stage real estate can be.) Shelves could be cut to whatever size you want, or cut the back shelf down to just a cross brace as before.
This looks kinda large and dorky though, probably better if painted black.
I didn't do much more with this, because I went on to develop the other "African Chair" design that I posted earlier, and I sorta like that one better.
Just wanted to post this to give people an alternative, and maybe generate more ideas from you all.
God Bless.