I think you just wrote the definition of “custom builds.”Hardly “custom builds”, I did assemble them though.
The 10.5” has a PSA upper with an MI quadrail, a Magpul AFG. Lower is an Aero with a PSA LPK and shockwave tube and brace kit.
The 8” is an unmarked used barrel and Keymod forearm on a Cerro Forge upper with a KAK flash can PSA upper kit, PSA BCG and charging handle, Magpul BUS. Lower is an Anderson with PSA LPK and Shockwave brace kit.
I enjoy putting them together but they are just range toys.