im at a stand still

im going to making my first piece of pep material i making the pistol from ODST any input of what size the stock scale is? i know in the game the slide and silencer are the size of one's fore arm and my pep says that the scale is 1.45. and also it is an HD model im pretty confident in my skills having built a plexiglass pyramid for my xbox just need to know if you think Im jumping in feet first in to something that will go over my head or not. thanks guys

oh before i forget here is my project pyramid:http://www.tech-forums.net/pc/f16/custom-plexi-case-234254/