Haha! I love this idea, brilliant!
The Tardis itself I would imagine to be reasonably easy to model (I say this yet can't model myself so, I'm going out on a whim to say that). Essentially it's just a block with indents on the outside.
However, seeing as you mean to have 4 mountpoints, where will those be?
I know they'd be inside of it but what I mean is, how are you going to make it look bigger on the inside?
You don't really want to sit inside a small cramped box. Also, while in FirstPerson View, how will you see where you are going? Obviously ThirdPerson will show the Tardis from behind as you're able to move it, but I don't know how you're going to get away with a windowless box.
If anything, the Dalek idea is the easiest. Your model is rather fine and looks quite Blockland friendly, so to say, however it's missing some points to it. The Two Arms are missing from the front and the actual base needs to go out a bit. It just doesn't seem right to be so flat on the sides. I also personally think that the section below the actual Dome is a tad too tall. I think it could do being slightly shorter in height.
Scripting wise, I think it should have a relatively slow moving character. While using 'Z' to look around in Third person, the Dome head should be able to spin in, if possible a 180 degree direction. Clicking should obviously fire the Dalek's Laser, however I think it should have some form of cool-down time between firing. Seeing as I'd imagine the laser to have a relatively high-damage. (Not necessarily Insta-Kill but about 75 damage, to give people a chance at least). Lastly, if possible again, I think that they should be capable of using Jets. The Jets should come from under neath obviously and should be slightly slower than the normal jets. Obviously it would need a new emitter, a much more spread out one and well, possible smaller in height, if you know what I mean.
A Cyberman would be brilliant. It wouldn't even require much more to the actual Blockhead. If anything a new head could be modelled (Literally, just having the Handle attachments) and then the rest should be Decals. Seeing as how the Cybermen are actually Human shaped, there'd be no problem to retaining the Blockhead design for the body. I'm just curious if the Cybermen would come equipped with a laser attacked like they do in some episodes, or would they require to pick up a weapon?
Script wise again, I think they should be slightly slower than a normal blockhead and without Jets, for obvious reasons. I'm also wondering if it'd be possible to have an electric grip ability. Sort of, by saying something like "/grip" or anything like that, the Cyberman would go into either the normal "/hug" position or "/hug" but with only one hand (Which ever one you think seems best) and then when the Cyberman is close to a player or bot that it knows is an enemy, it should do reasonably light damage as well as perhaps an Electric Emitter.
That's all I've got for the ideas here. Or, all that I can see purpose in sharing. Some of the things seem just a bit too much and a fair few people wouldn't understand them. Unless of course you're planning on a whole "Doctor.Who Pack".
