since the image upload size is only 3mb, the main image is blury, so here is a screenshot showing the start of the massive modular stack on the top half of the screenshot, and its I/O on the bottom half of the screenshot. one thing i found out is that big mergers and spliters have priority, bottom most node is the highest priority, whilst top most node is lowest priority, this mechanic is heavily used throughout. a lot of abyssal doors are connected to low priority nodes whilst the highest priority nodes are connected to the actual I/O ports to be used by other modules. this means that any overflow that isnt used by the main I/O ports gets dumped which is crucial for a module such as this that produces several different products and will stall if one of them is clogged. often i have also connected the lowest priority nodes of some resources main I/O which i know are excess into the inputs for the coin module, so that any unused products can be converted into coins. since this is on the lowest priority but on the main I/O, the abyssal door dump is still connected at an even lower priority as the entire main I/O is still connected to the highest priority from the dump, so any resources marked to be sold if excess will first be sold and only get dumped if the subdimentional markets are filled. there is storages connected to the highest priority in the main I/O, so before anything else, i always make sure that i have a buffer storage for building and emergencies