In order to put together a team through trades that can win the SB, the team already must be good to very good. The number of picks that you can exchange is limited, so you need to have a solid core. Other teams must also be willing to trade their stars and they must fit into the system.
It's definitely doable but it's not as easy as the media might think. The Rams FO did a very good job.
Exactly, you must be in a solid position first, then add impact players. It makes no sense to add stars and trade draft picks if the team isn't already good enough to compete. Rams had the core with AD, Gurley, even Goff when they moved to LA, but Fisher couldn't coach the offense. McVay and Snead took the core talent and ran with it. When Demoff talks about it he further credits Kroenke with giving the direction to make it happen ASAP.
Demoff also emphasizes that the "strategy" could change, or might not work at some point, or every year is different, etc. What this suggests to me is that the Rams front office were and are not following a preconceived plan. Instead they have been very opportunistic, very prepared, and very ready to add players when/if they became available and were a really right fit.
For example, Stafford, Miller, OBJ. There was no "strategy" in advance to add these players. The Rams instead took advantage of unforeseen opportunities because they were seeking to improve the team as soon/as fast as possible, and because they were quicker on the draw and more ready than others to put the most chips on the table.
So not sure this is exactly a "model," rather a series of moves that came about unexpectedly and which all proved out big time. And mainly because the Rams were smart enough to get the right players. (Jamal Adams, anyone?)