A bit off topic, once you get Chimeratech overdragon on the field with future fusion, can you then summon another Chimeratech overdragon with overload fusion. So you have two on the field??

Um nope, you would only have one, Future Fusion is sent to the grave due to Chimeratech's effect, when Future Fusion is removed from the field the fusion monster is as well (in this case Chimeratech), so when later using Overload then you will only have 1 CTech on the field.

And you can't do double overload on two chimeratechs either, sadly.

Now, actually you can, but well.....first one gets cancelled out.