Here's the Chimeratech/Cyber Twin/XYZ Deck. What do you think?

I would say a pure XYZ with "emergency support" from cyber dragon would be a better deck. run 3x Heavy Mech Support Platform instead of sprit reaper and marshmellow, run union frontier?(allow summoning of one lvl 4 or lower union moster per turn) and a set of roll out. the main points is to make xyz come out in spead of light. in case of roll out, foolish burial might not be a bad choice. also run monster reborn and premature burial for the return of X(mainly) and Y/Z to field. this allow you to pull them out fast. runnning a set of V to Z as combos is SO much easier to try to mix XYZ with cyber dragon fusions, just because the summoning conditions and combo setting are more similiar. I perfer cyber vally to Dekoichi as well, seeing you are already running return, which you might want to consider adding more copy of. a XYZ+one other in one turn is not fun to mess with. night aliant+Dekoichi might be an option, for an extra discard for XYZ, but I don't see much point to it.