+1 to MFL fittings. They make things much easier to clean, and occasionally swap around. I also recommend using 3/16" beer line for your gas too. This way any line can be for either gas or for beer.
Someday you will re-arrange your parts and wind up cutting lines off of barbs. With MFL you just remove them and use them somewhere else.
I have a 1/2bbl kegerator I bought on CL last year. I removed the original shank and faucet because I wanted stainless shanks and Perlik faucets. That part is up to you. I bought 2 stainless tower shanks from MicroMatic on eBay (I think). then removed the tower from the kegerator, and measured how far down the center of the shank hole was from the top of the tower. I made a mark 90 degrees from the existing shank hole, and the same distance down from the top. Hit that with a center punch to keep the drill bit from skating across the convex surface of the tower, and made a 1/4" pilot hole. I hogged out the rest with a step bit, and finished it out with a file (Because my step bit was about 1/32 too small).
My tower was held to the kegerator by 4 screws 90 degrees apart. However, the tower already had 8 holes in it's flange! That meant I could rotate the tower 45 degrees, and use existing holes in the tower base flange and the original screws, into the original holes in the top of the kegerator. This left the 2 faucets symmetrical to the front of the kegerator, and still over the stock drip tray.
Then I just installed the new hoses on the shanks, and the shanks in the tower, and the faucets on the shanks.
There's actually room in the tower to install a 3rd shank between, and a little below the 2 existing ones. Then I could tap all 3 kegs the thing will hold. I just haven't had a need for that yet. For my Broo-foo is weak lately
I'll go take a pic...