Dan McHale will build you a pack that will be customized to his designs, not yours. There is no off-the-shelf, one size fits all (or even S, M, L) pack. And there are a plethora of configurations for each design. IMO, Dan sells real solutions, not options.
At first his website seemed overwhelming and unorganized. But Dan walked me through his site over the phone in a few minutes, it then made sense to me. One good thing about the site are the large numbers of pictures. You just need to know if you need a Bump, LBP, Sarc, etc. Keep in mind that Dan wants you to have the perfect pack for your individual needs. You may find that the pack you liked on his site is not the one you need. So there is no shopping cart button.
You need to talk to Dan to get your perfect pack, so a fancy website is not needed.
If you don't demo the pack you need you don't get one. Dan isn't selling you a piece of inventory sitting on a shelf.
And the demo costs money and time to package and ship. Your demo and final pack are shipped UPS with tracking numbers. The packs come in a big secure box, not stuffed into a Tyvek envelope. You will learn a lot from Dan about packs during the process.
Some cottage companies will build you a pack of your design. But if you are so expert in a good design, you don't need someone to build it, you can do it yourself. Most cottage packs only last 2 or 3 years if you hike a lot. My full Dyneema LBP will out live me.
Think of Dan as a master backpack consultant, who happens to build extraordinary packs too.