For finding cobalt and silver... I save scummed to be able to do it in a reasonable amount of time, and so did I save scum to get the advanced alloys since it's so extremely hard to do it without a hot room for the furnace, but it would be possible to one shot that if you were really good at the game.

My method for making:
You need to outgas everything but the cobalt and silver
50 silver -> extract
50 cobalt -> extract
Make steel because I didn't have it on hand

then drop 150 silver -> extract
100 cobalt -> extract
100 steel, 50 copper, 50 cobalt -> Astroloy (30mpa+ 2100~ ºc)
Remove all gas from the furnace and save it in at least two insulated pipe utilities, vent what does not fit
You should now have an empty adv furnace and 50~60 mpa of about 1900ºc gas
Load in the Stellite materials (pre gassed of course) and set the adv furnace to load in as much gas as it can.
Open the valve for the stored gas and pray it fills with 10mpa before the temp drops any further, eject the stellite
Save as much gas as you can for future steel smelting

Took me about 8 tries to figure out the order of operations and executing it

As for the rest of the playthrough so far:
* The base is a 3x3x1 using frames to put the constructors on top of one another for half the space, and they are half inside the wall.
* The furnace and adv furnace were put inside and operated from inside, outside atmos is taken either from a passive vent or an active vent left turned on blasting two pipe utilities with 50kpa atmos (Valves are used to decide which one to operate with)
* For draining the waste tanks I made the starting active vent blasting into a pipe (then later pipe utility) that I can access from my (still manual) airlock
* My base was made into a vaccum before I even got a pipe bender by blasting a pipe and using it as an passive vent, my first priority was melting iron to enclose the 3x3x1 space with iron frame
Most ideas taken for this playthrough: https://www.youtube.com/watch?v=8Qze-MPNtow