Which one? The Master had many Tardises.

As for the Paradox Machine, I believe Ford or Milk mentioned somewhere that they have it planned

 Exterior Suggestion: Garden/ Shed Shack

Why I want this added: It would make houses look better with a "shed" in the backyard

How should this work: A basic, little, house-like shed to disguise the TARDIS

What sets this apart from the rest: you could land into your garden/ backyard unnoticed.

Shed Example: Season 5 episode 1 (2010), Amelia's shed or 

Exterior Suggestion: Fireplace Tardis (Castrovalva)

 Why I want this added: I think it'd be nice to have a greater variety of disguises for the Tardis other than just the Police Box. This Tardis would also fit very well in a house/living room setting

How should this work: A fire could be on/off in the fireplace, indicating a change in State for the Tardis.

What sets this apart from the rest: It's another Tardis the Master used, so it's canon. It's also rather short compared to other Tardis Exteriors. It could also have a unique mechanic for entering (See below)

 Extra info: There could be an interesting mechanic in which one has to sneak in order for to be teleported into the Tardis when walking towards it

Show content

 tree, piler, fireplace, ex.

 i believe the tree is already in the mod,  a pillar has already been thought about by ford,  and a fireplace was just suggested above your reply

 Exterior Suggestion:Pandora's box

Why I want this added:It would look cool if added

How should this work:It should work like any old tardis 

What sets this apart from the rest:It would resemble the pandora's box from Matt Smith's time in doctor who when he  got trapped in a tardis.

(here is a pic)

 In essentials, the 'how should this work section' is there because not all Tardis exteriors are a clear cut door opening sequence. You've got most of the Master's classic roster with (as far as I know) unseen entrances because he's had:

A. A pillar

B. A statue (how'd you go in that?!)

C. A massive computer bank

Forcing the modelers/coders to come up with how exactly it should open ain't fun, so putting some of that burden on the users suggesting it makes it easier on us so we have an inkling of an idea as to how it should work.

 I did put ex meaning the others?

Guys, please with the quote trees. Cut out the unnecessary parts. It takes space

 Didn't that one open from the side?

 Exterior Suggestion:SWD

Why I want this added:SWDteam can use it and players if they want

How should this work:it's like a normal tardis

What sets this apart from the rest:it has the SWD logo

 It has the SWD Logo.... But how does the rest of the Tardis look? :|

 Exterior Suggestion: Toyota Bookshelf

Why I want this added: It would allow for more camouflage

How should this work: The books are the door, and swing out. It should only be in the Chameleon Circuit, and not as an item

What sets this apart from the rest: It's a modified model already in the mod.

 Exterior Suggestion:Stacked diamond ore

Why I want this added:It would be hilarious to see players try to mine your tardis thinking its diamonds

How should this work:The doors would open like a normal tardis except for there being only 1 door

What sets this apart from the rest: Its a vanilla block unlike most tardises

 Exterior Suggestion: Dalek

Why I want this added: That would be fun to see players trying to kill it

How should this work: Doors are opening like in S9E2

What sets this apart from the rest: Dalek.

^ I think that one's actually a good idea, but it's also risky because what if some staff think it's an actual dalek and destroy someone's tardis when they're offline or away from the tardis. Also the diamond ore one seems a bit cruel seeing as how rare they are, also the tardis would then have to land in a cave for it to be realistic because you don't simply find diamond ore on the surface or near it, that's just too good to be true.