Ok, not gonna happen, esp in a junglePortable Medieval forge, so you can get an idea of the size/bulk of it.
Think the biggest thing will be the supply of coal or charcoal that would be needed to do major repairs.
I don't agree with this. By collecting the above info, the forge seems to be required to do a repair for heavier metals: the table has a column named "Repairability".You can, of course, houserule however you'd like. But RAW it’s the same set of tools and just a different DC between the two checks. A5E.tools even links to the Materials page for reference.
So, for Splint Mail/Armor, repairs might be fairly easy depending on what was damaged.I don't agree with this. By collecting the above info, the forge seems to be required to do a repair for heavier metals: the table has a column named "Repairability".
Maintenance thus appears to be for minor things (greasing, fixing small dents, repairing latches etc) and wouldn't require a forge, but a failed check means that the small repair was botched and the item is now damaged