Recommendations from the embedded wizards

Greetings from yesteryear (for those that don't recognize me). After two heart attacks, a bunch of fancy embedded metal around my heart, and three years of working on my basement part-time, it's finally done. And even though I had all but given up hope on using my AE700 on the suspiciously flat wall space that I designed into it, the wife (imagine!) thinks we should still use it.

Who am I to resist?

So I've got about a 12' throw, which according to the fancy calculator at Projector Central will give me a projected image size of about 80" wide, 45" high, with a 91" diagonal, and smack in the center of the green zone for image brightness for low ambient light, which describes the space (mid-basement, windows all have shades, but the walls are a light tan.)

So what should I put up and use. I can probably spend $100-ish without setting off alarms, and I actually do have lots of paint left over from the "good ol' days", although I'm not sure what the state-of-the-art is hereabouts now. I've got a Wagner HVLP thingie, still in the box.

Commence...

Edit: I hasten to add that, although I'm not opposed to painting the wall, I'd prefer to paint a piece of material or fabric/frame. Capisce?

Thrifty White Hardboard. Wasn't that your old CB handle?

And whatever I can find on-hand, I'm sure it isn't the right stuff. But isn't that just the life of the DIY screen builder, eh?

Delta Gleams Metallic Silver, for starters.

I figured you were going to get me goin' on Sintra again, Pete! Glad you're still around. What say you to my dilemma?

And all the Melamine is $4 off at Menards until the 17th. Any reason to upgrade to the 1/2", stability / flatness, etc?

OK, so here's what I've got:
Behr White Opal Pearlescent - 1/2 qt
Behr UPW - most of a qt
Minwax Poly Clear Satin - 1/2 qt
Delta Gleams Metallic Silver - at least 30 oz
Delta Gleams White Pearl - about 8 oz

Plus a good dozen assorted little Delta bottles of a variety of colors

And a good fat tube of Winsor & Newton Galeria Phthalo Green

If I toss it all together, it'll be shiny grey, I suspect.

So for RS-MaxxMudd LL v2.1, would a combination of the Behr WOP and Gleams White Pearl be a reasonable substitute for the 20 oz Rusty Metallic Accents White Pearl?

And would the Delta Gleams Metallic Silver work in place of the 10 oz of Liquitex Basics Silver?

Is this a "hold my beer and watch this" moment?

And should I roll this vs using the HVLP, or a toss-up?

I CAN drink anything. I choose to drink wine and my homemade margaritas. Summer gets some Mai Tais, and Bloody Marys in football season.

How is this sprayed? Just thin, even coats, 17 duster coats, or what? I'm fixin' to start mixin'.

P