new to 3d and if i had hair i would have pulled it out by now

[curious aardvark]

looks like a prusa I3 type. decent build volume too - which is good :-)
£137.88 !
Even for a kit, with heated bed, decent psu - that's amazingly cheap.
You realise it's a kit right ?
ie: you'll have to build it from scratch.
Interested to see how it goes - that's stupidly cheap.
None of the pictures show filament being fed. Can't work out if it's direct drive or bowden.
Bloody hell you can get them with delivery from uk warehouse for £129.99.
wonder if they work :-)

As far as the guns go - you'd be better off with digital calipers and designing from scratch.

Have a look at Openscad. http://www.openscad.org/

I find it much much easier to use than most cad packages as I don't have to draw anything :-) Just tell it what I want and where I want it and it does the rest.