I'm not afraid of external lines, I just like to avoid the clutter and 'possibility' of a leak. Mostly the clutter. Then the, expense too. I won't use anything but XRP or Earl's products and running a couple simple lines can hit you $300 before you're done.
Oil filters...uh-oh! Another topic....I'll say this much...Most 'race' filters I've seen are far too focused on hi-flow and achieve that by letting too much 'bad stuff' pass through. If it's not rated right around 40 microns, I don't want it for any engine I don't plan to rebuild pretty often. Like a lot of race parts, they compromise the long term for short term results.