For decades, it was very loud rock and roll. Audio mixing till the ears bled. Imagine mixing monitors for Jackyl, say, 4' - roughly a mixer & rack - away from that stage? Same with Frehley's Comet. And let's not forget Agnostic Front, Morbid Angel, Savatage, Type O Negative, Biohazard, Mudvayne, dozens more, and older loudies like King Diamond, Anthrax, Cro-Mags, Misfits, Motorhead..... - like I said: loud. At times I was doing 12 mixes, but mostly eight or less. Did a lot of front of house too.

edit: ah, I see you got the screen name. My tinnitus will never go away... It was worth it tho. For about 3 years *** Clark knew me by my first name. Priceless. He was every bit the consummate professional, and in every way imaginable. So mellow, philosophical, understated, and even the coffeeboy received direct attention and courtesy. You meet/work with someone like that, and you are always reminded that it's all just a job, and there are more important things in life, and Mr. Clark was right there with that. Humbling.

I was thinking of making a portable stage for your back yard and basement verity bands. Paneled in 4x8 sections . Maybe radius the back and have a detachable back and top that act as a sound projection device for over all sound quality. The top would act as a rain guard if the wind was not blowing to much .
I was thinking about sound drop off at out door venues do to nothing behind you or an obscure perforated structures that deaden sound projection .

I just wonder if baffling the back radius walls in a v shape pattern would be worth the return of time to assemble and deconstruct before and after gigs .

The other point of interest with all the bands in the world and growing << Would there be or is there an emerging market for portable stages of higher quality . I don't think they would have to be that big and could potentially be put in the back of a single pick up truck .
Maybe even rent a stage ?
Just a thought after the band hammered Me on it last night . How to panelize a relatively small stage that is portable .

What you think "cable peoples"
Think small out door venues , Parties, Parks, Weddings , and recreation areas . Corporate venues in the wilds

There are companies out there that have rolling portable stages that open up hydraulically, have a panel box supporting 200 amps for lights (LED technology allows for great light shows @ 75 amps) + 100 amps or so for audio power distribution racks or simple edisons built right in on the back of the stage. You can do scaled down versions, but unless this is for acoustic acts/orchestras or simple duos, you don't want a v-shape: the reflections would be a little weird. In fact I wouldn't v it at all. Concave rear would focus the sound in undesirable ways too. It's best to keep it flat, with cloth or some other surface that doesn't reflect anything above 1k hz at least, and probably lower. Let the speakers take care of the sound. You want the least sound coming off the stage as possible, the least reflections. If you build such a rolling stage, you could certainly rent it out easily enough I imagine; concerts in the park etc. would always be interested in things that roll right in. No issues with leveling a typical stage on grass, having performers at too low of a height for the audience, easy ups/tents not required if you're canopying the stage.

For years I set up a Pumpkin Fest outdoor rig on one of these stages. It was great. It opened out wide enough that we could even store the cable trunks etc right along the back out of the way. Extra mic stands and monitors stored there also for easy set-ups from band to band. Look at what you see on line and duplicate it if you have the materials. Just make sure it's deep enough to allow for performers and their monitors/pedal boards etc to be set up in front of the drums, which take up a lot of depth. Depth of the stage is a wee bit more important than width imo.