It can probably be done fairly easily on a huge abundant map. I've been close to 20,000 a turn on a gigantic but with occational / uncommon settings for planets. (don't remember exactly) Basically I just had 1-2 farms and 3+ stock markets on every planet, max trade routes, tax at 80%, etc. Nothing special, just a lot of it. That game I had most of my planets setup for just economics. I only had starports and decent production on a very small number of planets. One planet produced my entire military and it was building constructors half the time since I upgrade my ships instead of produce more. I just tend to favor economy > research > production. If you aren't able to keep your production / productivity at 100%, those factories and research facilities are just there going to waste. I also like that with spare BC you are incredibly flexible, buying galactic wonders the turn you earn the technology on a pitiful (but protected) quality 3 planet is nice so that you don't use up space on your capital planets etc. I also like how you can buy industrial sectors for every new planet you aquire until they are up to production whether you took it by force or culture flipped it, it makes them useful faster. It can be detrimental if you focus too much on money, and of course, as always, it's a matter of play style and preference.
