hello, i was wondering about adding your own tardis exterior and interior if anyone knows how to do that i'd like to hear it. also i want the doors to slide into the sides. also adding a console block maybe?

 It's not possible, but I have made suggestions here Tardis Interiors and here Tardis Exteriors.

I am hoping the Team considers a way to add in one's own premade Exterior or Interior some time, though. 

It would be a pretty cool thing