The SO and I bought a pair of identical F800GTs to have lighter bikes for the mountain twisties than our heavier R and K bikes. This thread will contain a series of posts with photos showing how we set them up.
Right from the dealership these bikes had Suburban Machinery footpeg lowering bits and Motorad Verholen bar backs that move bars both up and back.
Also a Fuzeblock installed on top of the air box to facilitate future install of electrical accessories. The Fuzeblock uses the factory gps circuit as a trigger so has about a 20 second delay to shutoff after the key is removed.
Her bike has the std seat- she's 5'6"; mine has the comfort seat- I'm 6'.
The intent of the ergo mods was to get the bike closer to the F800RT that BMW should have built- that's what US riders asked for, not this GT, which does not have proper bars or peg locations for distance touring unless you're a midget with long arms. Maybe some day they'll actually build a bike for US customers that shows they can listen.
Also added were the Garmin 390 GPS on mounts from Touratech. I connected it through the Fuzeblock though a BMW service connector can also be obtained and used.
The red switch on the bar came from Eastern Beaver and controls a pair of Solstice SP-120 lights from VisionX (shown later) to complement the low beam.
The little black box with the red and yellow knobs is a WarmNSafe remote dual controller attached with 3M DuoLock- way better than Velcro.
Shown in the pic of the foot peg lowering bits is an oil temp gauge from Wunderlich. I filed marks in the stem to correspond to factory oil dip stick levels so it serves that function also. Operating oil temps are a little under 100 C at speed.