We have a 5/8" return line. You don't want oil backing up into the system and I've had the dip stick tube pop out under boost, I wouldn't want oil returning there. Taking off the oil pan and welding a bung for the return line is universally considered best. You could buy a spare one cheap and do that to make the downtime less, that's what my dad did.
That pic is good, you can also use a T at the oil pressure sensor. There's also a sunken hex bolt/thing near the oil filter that would give you oil.
My dad just made his own Focus turbo kit, he also used the stock manifold, but he bolted the adapter not welded it. That way if the manifold ever cracks, you can swap out a new one easy. Though, as long as you add a brace to compensate for the extra weight of the turbo, the stock unit is pretty sturdy. Also flows decently, one guy hit 300whp with 14psi, 65shot and race gas, with the stock manifold.
You'll find the crank position sensor will be in the way a bit with an internal wastegate. We made a small flange to re-mount the wastegate away a bit for our first kit, then my dad figured out all you need to do is make a new plug for the wires so it's slimmer and it will work.
I wrote a turbo FAQ for my Cougar boards a while back. The info is a year old or so and some new things have come up, but mainly it's all you need ot know. The boards reset a few months ago and all the FAQs were lost. I haven't had a chance to rebuild it, but google has the pages in it's cache.
Page 1 Page 2 Some info that's a bit outdated: Pro-M is out of business I believe. TurboTom now recommends blow-through mafs, not suck thru like he used to. So get either a Musgang GT MAF or Cobra, a Lightning would be a bit too big. A few Foci have hit 300whp on 91-93 octane. The JRSC fits our engines with mild mods, the Vortech won't.
