I think Jeff knows the drill for the frontside. Here's where the front / backside 12 miler differs from the normal "friendly frontside" 8 miler.
1. The balance beam. As you climb the front side, you'll proceed up a series of switchbacks. After leaving the firetrail, you'll hit a right hand switchback, a left hander, a right hander, and then a four way junction. In the past, I always made it a left hand switchback. Now, I follow the trail straight for 100 yards. Two trails lay straight ahead - the left hand fork is technical, while the right hand fork is a simple, gradual, fireroad climb. After 100 or so yards, make a left. This will lead you to a clearing with the balance beam section. Clean the balance beam then proceed down the short rutted chute before finishing your climb to the top of the front side.
The balance beam is about 1 mile into the ride.
2. Hitler. After the paved road grind to the top, most people take a breather. After reaching the top, look back in the direction you came. The paved road you ascended drops down to the right. A dirt fire road climbs for about 50 feet to the left. When you have caught your breath, climb the fire road. As it turns left and starts to drop, take the singletrack that branches off to the right.
This is Hitler.
It gets pretty technical on the way down. It starts off as narrow singletrack over roots and ruts, forcing you to hang way off to clear a fallen tree. 100 or so feet after the fallen tree, you'll find a steel, rutted, technical chute to the left. Take the chute down to the fire road. Cross the fire road and hit the singletrack.
This is JT Howell.
Follow the singletrack for a few miles, until it reaches the fire road. Make a left on the fire road, and climb it for about 1/4 of a mile. The fire road will switchback up and to the right, and there will be two metal signposts straight ahead in front of some singletrack. Climb the singletrack.
4. This is Corkus.
This goes on for maybe half a mile, spitting you out on the paved road on top of the mountain. If you can clean the last 50-100 feet of rutted, rocky, rooted trail, you are the man. Once you're at the top, the Ridge Fire Trail (dirt road) is on the other side. Instead, make a right and climb for about 50 yards. You will see singletrack on the left hand side. Take the singletrack.
4. This is the first chute of a section I like to call "Chutes and Ladder".
It used to be longer, until a tree fell into it. Now there's a detour, but it cuts the technical chute in half. The chute rejoins the fire trail. The fire trail will go straight for a couple hundred feet, then it will arc left and get steeper, with several deep ruts in the middle. The fireroad will then turn left again. At this second left, you'll see a rutted steep singletrack chute going straight ahead.
5. This is the second chute, and the ladder. If it looks too steep (my co-worker did a flip trying to drop it), you can follow the fire trail around it. If you're able to clean both the chute and the climb out (the ladder) - you are the man. I've done it once.
Make a right on the fire road. The fire road will fork in a couple hundred feet. Take the left fork.
It will wind down a ways. You will see singletrack coming in from the left, I think near a powerline tower.
Stay on the fireroad as it sweeps to the right.
Another couple hundred feet down the fireroad, you'll see singeltrack on the right. Take that singletrack.
You're now back on the "friendly frontside". Jeff should know the rest of the way from there.
Note: A few sections of trail (Hitler, Corkus, Chutes and Ladder) aren't really legal, but they're a lot of fun. If you guys see rangers near the helipad / nike missile site at the top, you may want to bypass those sections.