Agree, you also should factor in :
Philmont is strict with the height/weight guidelines and reviews upon arrival during medical re-check.
Even though you are an adult, you are still considered a crew member - in addition to your personal gear, you will be expected to carry your share of up to 3 days of food, water, and crew gear.
At Philmont you can be 20+ miles from base camp and the back roads are difficult to traverse in case of medical emergency. They shut down the roads last time I was there due to the rain and mud. You don't want to put your Crew at risk, if help can'