It is theoretically possible to build flaps, spoiler and slats in such configuration with slight modification
Flaps can be built open in similar manner to Andrew Inwald's D4Y2, with additional modification on underwing pods
Slat part can be printed twice and supported in place using little pieces of paper
Thrust reverser is slightly harder since it involves interior of the engine
Anyway have you seen the guy who tried to make fully (OK, partially, but mostly) functional paper model of triple 7?
Model 777 Project - YouTube