a mod where theres a block that is a market place where you can trade certain items for other items. you could set category's for what is being sold and bought on the market place via a script. and register items being sold for a certain item also via a script. there would also be another block called a shipping bin where items placed in it would get shipped to the market and would be visible on the market screen via an overlay. you then could sell the said item for another said item, there would be another block called the reseaving bin where any item traded via the market block would then be placed in the said bin.
a in world 9x9 crafting table made from a custom block called modular crafting stump. you would put 9x9 of these in the world and they would form a multiblock. then you would place down the crafting recipe in the 9x9 then use a crafting catalyst to craft said item/items. if it is possible this could be an addon mod to primal tech if possible?