A Pro is a hand-built gun with the best of everything, which is why MSRP is over $2k. You might be able to buy/build a pistol that looks like it for around the cost of a loaded, but not one that will perform like it, especially long-term.
The S&A mag well is "blended', which means they match the magwell to the gun. It is very easy to botch this job.
To put Novaks on a MilSpec you will have to have the slide machined for the Novak cuts. A loaded has Novaks.
Buy a loaded and call it good.
Drop in parts are not, they still require minor fitting that takes skill, knowledge, and tools. All of which cost $$$.
Without the S, K, and T, you will have ruined parts and perhaps a ruined gun, which will cost far more to repair/replace than the difference between a milspec and a loaded.
Or, buy a MilSpec and save for sending to Yost-Bonitz or someone else for a package upgrade.