I have several years of experience in the development of mmorpg games.
But there are some things I am not convinced:
1) Using the Arbitrary Messages to store the player, that means one NXT by every time you play? is unfeasible.
2) Asset Exchange to trade items? would be easier if I had an own exchange system with NPC trading.
3) Not meant as mining work.
I have not seen a concept of how the game should look. Points of the expectations of the idea are, in my opinion, very little practical.
Regards

Agree with point 1, disagree with point 2, don't understand point 3.
If you are going to win items that are worth NXT then you will need to put in NXT to pay for these items.
Its not like the producers are going to load a server with 1000NXT worth of prices and just give them all away? Somehow there needs to be funding for this.
AE should be properly considered for items. IF lumber, gold, stone, steel, etc are issued assets. There will have to be a FINITE supply, and if we are talking proof of burn for forging, then forget running out of toilet paper, we could run out of steel, glass, etc.
I think for resources we should consider the minecraft example, with infinite raw resources that you can earn. sand, dirt, wood, rock, ore, silver, gold and diamonds. Just remove the grinding nature of hammering bricks, and in its place make a time setting, like
"you have come across a vein of ore, do you wish to mine it?" and it will put according wear on your shovel, pick or sword and take a factor of time (24 hours say) and at the end of that produce Xgold, Xiron, etc..
Def need a ASIC Pick Axe +1. works well but gets hot and is outdated quickly. ha.
Then same with forging items. There can be certain workshop sets, that can build all kinds of items, but they will be specialized.
Lvl 1 Workshop costs 1000 lumber 1000 stone and can produce simple things. Wood logs, stone blocks, good for castles.
This workshop can be upgraded, with a choice of specialties, that lead to more and more specific and advanced technologies
Logs to Lumber Mill can split to furniture, or arrows leading to fine carpentry or war machines, etc.
A player could hire NPCs to run these things even. A NPC could gain skills in specific trades and you could maybe even sell a well trained NPCs contract if say he was a Lvl10 blacksmith.
I know i'm over brainstorming this whole thing but ideas are flooding in.. I think an important thing is make a roadmap for features, and we do not have to have them prepared, but planned to roll out if needed.