Hi, I like this scenario very much, thanks.
I want to ask you what I am doing wrong with the Dimensional Chunks Upgrade.
I have a market with a trade of 1 Low density structure for 5 grenades. I made a set of factories for grenades and overfilled both the blue chests of the market with them. I ended with 2 full red chests of Low density structures but the upgrade still didn't unlock.
Thanks.

Try add a little more grenages so that convertion fails due to full output chests.

I've tried this already, in both the blue chests there has been some 10+ grenades.

On source code investigation I found that in markets.lua line 214 there is a condition:
if buyInv.is_empty() and buyInv.get_bar() == 49 then
For my red chest the second part is true but the first one (buyInv.is_empty()) is always false and then the condition fails.
Can somebody tell me what the expression buyInv.is_empty() means?

Probably that it has to be empty before transfer...

Yes, thanks.
Looking at the code I suspect I should have put all the items in the blue chest at once. The mistake was that I filled the chest continually as the factory was producing the grenades. I'll try it.

Note that 48 stacks of grenages will only produce exactly 48 stacks of LDS with 5:1 price. You may need to find something else.