Hey now, a bit of credit where credit's due, I posted this below on the 24th Jan on the Updating Your Minifigs thread (probably should have posted it on this one in the first place):
http://www.eurobricks.com/forum/index.php?/forums/topic/108914-updating-your-minifigs/&page=21
Hello I'm new here and signed up just to share that I thought I'd have a go at creating a custom Saw Gerrera. Couldn't find any hair that I thought looked right, at least in a suitable colour, so went with the bald Saw from the flashback scenes and early Rogue One trailers, using pictures of a Saw action figure for reference for the rest of the outfit.
The head is custom from Firestar Toys, body armour is a galaxy trooper, torso is some space police I think, the utility belt is a custom Si-Dan G8 Tactical Belt, with a tattered Boba Fett style shoulder cape hanging out from under the rear right side of the armour, legs are a peg leg attached to those of the Kendo warrior collectable figure. Wanted to use a clip on his chest to hold his breathing tube in place, however it kept looking too bulky. So at the risk of him looking like he might start to do some hoovering, I opted to have him just hold it instead (wish I could get the end clip of the hose in trans-white for the breathing end). Incidentally whilst losing a bit of screen-accuracy, I've since removed the tube since I felt it was a bit too bulky.
I like to think I've come reasonably close:
IMG_3054 by Daddy Stardust, on Flickr
WHITAKER-HEADER-ROGUE-ONE by Daddy Stardust, on Flickr
Hasbro-Saw-Gerrera-Rogue-One-Figure by Daddy Stardust, on Flickr