what i think he/she is saying is that they still want to keep the stock strut assembly intact and with the new struts and coilover sleeves is get new uppermounts and bumpstops. putting together the stock springs, struts, and uppermounts will be a real pain in the ***.
i'd suggest just getting brand new, or used if you can find some at a junkyard, uppermounts and bumpstops(just modify them for the new suspension). there, you'll have two separate suspension systems that can be swapped out easily.