@FAAace09 it won't matter if you run body on or body off, closed chassis vs. open chassis. You're car is gonna get dirty ugly! Just a fact of life. I'm running a 5T and the body is basically just a roll cage around the chassis. The real quality nasty bits will always find a way in, especially under the damn motor!
But you're definitely on the right track! Mesh mod your crank case and either Outerwares or mesh mod your pullstart/flywheel. Keep the big gritties out of that bit of the motor to keep it alive. The TR pull start is a nice piece of bling, but I think you can spend that money elsewhere for a higher impact on your fun. That's completely up to your taste.
I'm a big fan of TR's clutch systems. I'm running the racing (open) version myself. I think the closed system will likely only benefit you if you are running in sand. I've never had an issue with the open system gathering dirt. I run in high weeds, grass and on a dirt track. But again, it's your money, you spend it how you want! You can't go wrong with TR clutches, no matter which you choose.
I can't speak to the Kraken X3 Chassis. But it might be an option for you. They're highly rated for durability. I've bashed the everloving hell out of my stock 5T chassis, with nary a hiccup. I just have to clean it every few runs. But wrenching and cleaning after a gnarly run is just a part of the fun for me.
I will
NEVER recommend using a paper or cotton air filter in an off road rig. Both will work just fine on-road to an extent, but they only offer a single, thin, layer of filtration. Dual foam filters empregnated with oil is the
only way to protect your motor in dusty, dirty conditions. Use an outerwares pre filter if you want to keep the big bits out, but if you want your motor to last, always use oiled foam under it.
If you do end up making some mods, please post pics! We love pics of build around here!