Ground is ground is ground. Bottom line you have everything grounded to the frame at one point or another. Running cable all the way to the front to keep the back of the frame from shorting on something will not gain you anything since the frame is still grounded. I would use less cable and save your money. If you break your frame, a missing ground is the least of your worries.

One common ground point has its disadvantages too. For example if you have a bad ground instead of loosing only one item you will loose everything. Or it is a lot easier to snag a wire and rip it loose than it is to snag your frame and break the connection. Eliminating 1 of those wires reduces the chances of catching one by half.

4crawler, Please do not take this the wrong way. I am not questioning your decision to run a ground cable nor am I saying that it could not be done right. Just exploring the options pros and cons.

Not sure how I would do it myself.