FYI the Excursions used the older dash so a '05 Excursion does not have the '05 pickup dash and gauge cluster etc...keep in mind when looking at parts.
The Floors can be vinyl from ford, mainly the police / fire excursions, or you can get a custom vinyl floor from auto custom carpets. I have one waiting to go in on of my excursions. The A.C.C. floor is much thicker then the stock vinyl floor.
I recommend Husky Floor HD liners. You can get the front seat area, front trans hump, middle 3rd row, and cargo area liners. I have all of them in my 2005. Awesome, especially with kids. Summit Racing has them about the cheapest.
I like the F650 Lower Dash mod. It allows room for gauges and aux switches. The dash is different for manual or automatic trans F650s. I like the Manual version better. I doesn't stick out as far, and I may swap my 2005 to manual trans any way, and my 2000 excursion is already a Manual.
Riffraff Diesel Performance Parts: - RDP Custom F650 Dash Kit
The panel itself is really reasonable from ford. I think its about $20 when I ordered mine a few months ago.
If you don't do the F650 many guys do the Ford Upfitter switch set up...it looks nice but allows no gauges.
If you do switches I would add one that ties into the factory the high idle. the excursion do not have the factory high idle wiring easily accessible. You need to add a wire to a unwired pin in a Harness connection to get it. I plan on doing this mod to mine.
Recon makes lots of LED interior lights, and lit aluminum door sills etc..
Some people swap the '08 and up center consoles in... looks nice.. I want to add a 60/20/40 front bench seat to my excursion. Is hard to find a nice leather one, and I have never seen a 2 tone factory front 60/40 seat. So I may have to get one recovered to match the black and tan Eddie Bauer seats I have.
2005 EB Excursion 4x4, Gauges, Scan Gauge II, CCV Vented, Zoodad, EGR deleted, rebuild 6.0L, Studded, BPD HD with Winter setup, BPD 58v FICM, Jesse Warren and Gearhead SCT Tunes, Coolant Bypass Lines, Warren 155/30's, Adrenaline HPOP, Wicked Wheel, Rebuilt VGT, Opened Map Width Groove, Diesel Site Boots, Ported and Deleted Intake Manifold, Regulated Return, Bean's Sump, Aeromotive A1000, 4" Stainless turbo back Magnaflow, Custom Front Bumper, Andy Warren Comp Trans, 09 trans pan and filter