Looking to buy n build a yeti but can't decide wich route to go. Which option do you think would be the most bullet proof, if cost was no factor? And which do you think is the best strength per dollar? Which is the best way to upgrade a yeti's front end Yeti x conversion or aluminum up grades?
Cost is always a factor - if not, why would you be looking to make it "bulletproof"? Part of the fun is working on them. If it didn't break, you would get bored and move to something else.
What problem are you looking to fix? If you buy a yeti, you're covered by warranty if anything goes wrong as long as you drive it within the limits of the RC.
If you're going to spend a ton of cash on a Yeti, why would you beat the snot out of it, you know that it is going to break by doing that.
If you want to make it bulletproof, leave it on the shelf and put a bulletproof case over it. After all, no matter how much money you throw at it, you're always going to break or wear out something....even all aluminum upgrades.
Bottom line, be prepared to break parts and spend money. But, that goes with any RC - nothing is definitively bulletproof. I think you should save your money and just fix parts as they break...if you break them more than once under normal operations, then you know that is a problem area for the way you drive your car and at that point look into corrective measures.
No sense spending too much money for no reason right off the bat.
My 4 year old has yet to break anything on his Yeti, but I have the punch control turned down and I am using a 2900kv motor instead of the 3150 to keep the speed down on 2s for him.