Here's a tip for anyone planning on replacing their lower oil filler tube: move the alternator! That front bolt is a doozy to reach considering it's blocked by water hoses, wires, and the alternator bracket. The last of which I found just too difficult to overcome. Do yourself a favor, unbolt the alternator and move it over just one inch towards the passenger side, this will give you the clearance you need to reach that front bolt. The Bentley manual has pretty good instructions to help with this process. (You have to disconnect the wires on the engine block side and remove a plastic cover to create clearance room.)
For this project, I removed the:
Air duct between the air filter/MAF housing and the throttle body
Throttle body (now's a great time to clean it!)
Intake tee (with rubber couplers)
Alternator (as discussed above)
All in all, a doable project. Definitely one where moving other parts makes all the difference!
Jay
99 Boxster