Most production happens in factories and workshops, either here or overseas. Some processes, such as smelting iron, just take facilities not practical to replicate in every AO. Division of labor happens here, and likely a few production cycles can be subverted.
This doesn’t change that a fair amount of delicate work, and skill building training will need a local location with the proper equipment. Restrictions on travel and trade could likely also prevent much besides some raw materials from being transported. A hackerspace/makerspace/fablab is a good place to work around these limitations and provide discrete customization. While some might nitpick on the meanings, the similarities prevent it from being effective. The labs and spaces are intended to bring together little people who might not otherwise be able to afford some of the equipment used, and sometimes expertise. Some are organized in networks, and will have standards that might prevent working on certain projects, others won’t. They will also work on a variety of topics, gardening and other seemingly esoteric subjects might be covered.
Almost everyone here is probably working on PT, and training with guns and hopefully medicine and radio. While radio can fall under electronics, most likely you’ll find your group lacking in some skills you want need. Your group doesn’t necessarily need to have members with those skills, but be allied with groups that do. A good source for this is the local hackerspace. A militia or other group can provide protection in times of trouble for the nerds at the hackerspace, in return getting skills and manufacturing capabilities otherwise unavailable. If you don’t have one in your area, starting one is a good idea, and sometimes a second one won’t hurt if it’s far enough away from the original.
Keep in mind part of the goal is to interact with non-prepper/patriot types. They’ll likely be excited by new people with new projects, but sanity, as they say, is in the eye of the beholder. Aside from the usual gentle stuff, “I’m gonna protect you from the zombies and you’re gonna work” can wait until after the collapse.