Did madmole post this? Then why do you still need to ask?

He is the owner of the company, you can't get a better source.
One correction though: "weapon combine" and "weapon parts" is not the same. TFP will likely make adjustments so the features work well in the current game, see the jars as an example, that they need a crucible is new.
For example TFP could simply make it so you can combine 2 complete weapons in the workstation and the resulting weapon has slightly more damage than the better of the combined weapons. The weapons already have slightly randomized properties when you build them and that could be used by the weapon combine features without really overhauling the whole weapon concept.
Or they could simply give some quality value to weapon parts but still have identical weapon parts, not broken up into 4 distinct parts like it was around A15