Using the Simpson Strong tie method, you use 1 7/8 inch drywall screws. Not deck screws which fit the hole but are larger in diameter. you use drywall screws. The small diameter once extracted doesn not leave a gapping hole and has proven in the real world that the same lumber if properly stored can last almost 30 years and counting.
The 2x4s are in this style laid flat on the sheet of plywood. They could be made into the interlocking style of panels for more square designs. Recently somewhere on the trading post, someone is selling walls, I think Fright props. Look at how high they are stacked. Then imagine if the air was let out by the lumber being placed flat instead of like conventional construction, it would take up half the space to store.
You can also place the lumber that an assembly is an 8 foot by 8 foot panel so that long straight runs are stiffer. Bolting is good too. I generally only use this on big heavy facades that will be outdoor and in the wind. The problem is having every panel identical with a pattern that actually lines up properly and what you have to do if they don't.
Storage comes dowm to how big of a trailer you will need or ultimately how many trailers if you get into lots of panels that are thick. However most haunts I see do it with conventional style on end lumber. This as well can be screwed on the fly together in any weird angle where bolting limits you to a square design.
The specific Simpson Strong tie # is A-21, a 90 that you would hand bend to any angle you need and I have found an TP15 that is much cheaper that is as yet unbent. In the JB Corn or Godfather method, you would have 4 such clips one at ancle and one above the head on each side of a joint. Each is rated for 175 pounds, 4 becomes 700 pounds of donkey prop hanging power per joint.
These clips have gotten a little expensive though. A-21s were 31 cents and all of a sudent they are 78 cents to 98 cents each. The tp15 is 40 cents and looks like it could make two of these if you desired to. The new price after tax is now $3.37 per joint which gets expensive. However in the bigger picture, no one is going to just rush out there and be like you if if is kind of expensive and specialized. A customer or wanna be when they start figuring that you have a thousands dollars in clips and misc hardware for exit doors and such will stand back a bit.
Using bolts you have sometime times several panels floating above an irregular floor and have to put wedges under to support at joint edges. Having to force things square especially with lumber means tearing it apart. The clip mathod conforms to what ever surface, can even intentially be set to tilt a bit and stay together once assembled. With the clip or hrricane tie method it doesn't matter what kind of gap you have or the panels can be made to even over lap to make up for or loose a floor dimension.
Another fabulous post from the U.S.Department of Wild Imaginings, now in spectaclar stereo, sponsored by the Adhesives and Sealants Council, suggesting ways to stick things together since the 1800s. Not fabulous in a gay way. Your results may vary. Illinois residents add 8% sales tax. These posts have been made by professional post makers, do not try this type of posting on your own without extensive training, lovely assistants and a trusty clown horn.