I think you have 2 scenarios:

Inflation: your best hedge is the 30 years fix loan to buy the house, house prices will increase with the inflation and you debt will be eroded.

Deflation: Here the problem is that you end with an asset that will lose value over time and you have payments to make with money that is more valuable everyday. I believe this is the zombie apocalypses scenario. I think you should try to use a FHA loan, really low down payment and keep all the cash possible in hand to use it in case of emergency. I think deflation will be a brief period, with a 30 year mortgage you will not have a problem as long as you keep making your payments so keeping cash in hand is your hedge. I think it will be a brief period because the government will try anything to avoid deflation, you may end with a free house....

In both cases as long as you can make the mostly payments comfortably, you should use the lowest down payment possible, think on a typical 25% down payment, if you believe inflation is more likely, take a FHA loan 5% down and use the rest of the money to buy something that will appreciate with the inflation (PM, Bitcoin?, rental property). Otherwise, take the same FHA loan and keep the additional 20% in cash (or cash equivalents).

Just my 2 cents. 

It really doesn't matter. The optimal way is way is to buy all at once. So if buy all the assets in the portfolio in one shot most likely you buy few asset classes cheap (the ones that are not doing well) and few asset classes expensive. The whole idea behind the portfolio is non correlation over time. This is the most important feature of the portfolio. All you have to do is re-balance once or twice year. So you sell the profits from the assets that went up into the assets that went done. The entry point does not matter. Over time because of non correlation you compound your returns very nicely. If you do not have the capital to invest all at once, then you dollar cost average on a monthly basis equally across the 5 bucket asset classes mentioned on the paper.

The idea behind the Hawk & Serpent (Dragon Portfolio) is retaining control of your optionality through time. It's born of contemplation, not speculation. The whole point is to remove speculative bets from resulting in a catastrophic loss scenario over a long enough time horizon that proves skill over dumb luck, though "luck" will always be part of it. And so you put it on, and adapt and refine it as you go. 

But can you live with it outliving you? That's the hard part. You can't "speculate" in the incorporeal. Again how do you retain control of your options beyond this lifetime? That, I believe, always involves a duel with a dragon (devil) at some point, which is implied in the allegory. 

You have to drink its blood. You have to beat it, or loss it all either now or later. So make the world beat your portfolio. Design it impeccably. Will it succeed? That's the challenge posed by the dragon. The world is designed to suppress [your investment]. That's the belief which is embedded in this portfolio strategy. And if you believe that, then you should give it a go. 

Just a thought. Thanks, and good luck.