halo odst smg, need measurements

I wanna build an odst smg from foam but im having trouble finding consistent measurements, anyone have some?

this should get you on the right track

Its a bit pricey i think i got mine for 40 or 50 but theres a more compact verson. The best purchase you can make if your wanting to continue making Halo universe props. The Halo encyclopedia is my best friend. Its has alot of nice measurements. They are cannon lore by 343i. so its the most authentic source you can get. It has full size pictures of the ammo used also.