Recreate and adapt SPLIT SCREENS & CUT SCENES from Guy Richie's "The Man from U.N.C.L.E"

I wanna reproduce the Split Screens & Cut Scenes from Guy Richie's "The Man from U.N.C.L.E." Adaption to produce a complimentary (i.e. free of charge) teaser-trailer commercial for an artist friend of mine. [login to view URL] My friend creates sculptures, architectural structures (e.g. garden pavilion) & gadgets (e.g. pizza oven) by welding steel combined with carpenter-grade woodwork & many other creative solutions and materials. --> [login to view URL] <-- Therefore, the whole theme of metal, steel should be present as the bars separating the split screens and elsewhere. I'm doing O.K. in After Effects, but definitely need some pointers on the most efficient and tidiest work-flow on how to approach this. A post of mine in the Adobe Community left me with even more questions (precomposing, tracking etc.) [login to view URL] Many best regards & thanks from Switzerland, Sandro