Cutting Long Logs with an Alaskan Mill

Jon asked Bryan.... "I was wondering what you have found the best way to start a log that is longer than your starter (guide) board?  I have tried sliding a board along lag bolts with mixed results.  I may build a frame out of steel that I can add onto.  Reason I am asking is that I will be making some long cuts for a ridge beam in the future."
To Jon from Bryan
Use 2 1/4" common bright nails, not Lag bolts, with the string method.  Put the nails about 24" to 30" apart. To make a 24' beam, I would use a 10' board and move it twice.  When you place the board, have it fall just short of reaching a set of nails on the front end.  When the mill has cut past the last set of nails supporting it, you can lift the plank and slide it out without disturbing the nails.  Lay the plank down and pull the mill back 2 feet and tuck the plank under the mill, making sure the front of the plank falls just short of the next 2 support nails, and repeat.    With a little practice and patience this becomes old hat.  
When using the nail method, before you lay the plank on the first time, especially on a long log, eyeball the nails, make sure they are perfect.  I sheeted a large floor with 26' 2 x 12 using this method.  These boards fit better than most factory lumber would have.  Do not attempt long cuts if your saw isn't cutting absolutely perfect and you've checked that your bar and chain are not under tension from mill adjustments.  This is what causes lateral grooving on the lumber.  
Perfect this method and you don't need all the cumbersome hardware.   
Good milling, Bryan