From my experience the cost breakdown of a typical [0] satellite is on the order of 60% recurring engineering, 40% non-recurring engineering. I don't have a goo

From my experience the cost breakdown of a typical [0] satellite is on the order of 60% recurring engineering, 40% non-recurring engineering. I don't have a good sense of the breakdown for JWST but the assembly and verification campaign is huge compared to most satellites and they would have to do that again so I would expect the recurring engineering to be higher. Coupled with the fact that it wouldn't be directly build-to-print due to parts obsolescence and technology upgrades they would want to make the cost would probably be higher still. So its not going to be a huge cost savings but you could maybe do it for something like 70-80% of the original cost. As for the timeline, that's going to be a hard one to change. Consider that all of the mirror segments and optics were delivered by the end of 2013. So the integration and test campaign of the spacecraft took 8 years. There would definitely be some optimization and lessons learned from that and you could likely shave off a couple years. However, if we are also looking at building it "now" the supply chain issues also hit the aerospace industry. There are typical things that you would expect like chip shortages, but also random things like its difficult to buy the epoxy we normally use to glue solar cells on to panels. [0] "Typical" varies wildly here. So for typical I am assuming something like a large NASA earth science mission with building one spacecraft of a relatively unique design.