Sill repair panels

Ok, so I reckon this topic is suited to any/all land rover types, although my own case is a Discovery 2, hence my decision to post here.
I am in the final stages of a D2 re-chassis project and have now reached the "preparing for mot" stage. Accordingly I took the chance to investigate the nearside sill this morning. Verdict.....could be worse. (offside probably will be....)
Anyway....I removed the 10 plastic rivetty things that mainly hold the plastic sill cover in place - and then found that by some miracle the 10mm flanged nut at the front end actually undid without any trouble! Shock> Horror!
Onto the sills themselves. The inner sills don't look too bad - to my untrained eye.
The outer sill - now that might need a little work...maybe....
In my reading and research I had concluded that 100 x 60 x 3mm box section would be the way to go...but now I reckon I might get away with doing just the outer sill? Unfortunately, a lot of the articles on here and elsewhere about re-doing the D2 sills have suffered from the changes to photobucket a couple of years back and are no longer as clear as they might be.
Anyone got any recommendations - easy-on-panels, YRM, other?

Had a couple of bits from Froggatts (Easy on) for my RRC - the last being an "INNER SILL BODY MOUNT BRACKET AND BACK PLATE" - & was impressed with the quality & ease of fitment.
https://www.froggatts.co.uk/page10.html

I’ve always used YRM and they’ve been excellent

Well YRM seem to reckon that the D2 sills are different from the D1 and so don't do them. Froggatts will have them with the courier tomorrow morning.
Sorted.

I have used both and were good. D2 bodies starting to go now. I just fitted sliders to mine and one sill is just starting on the inner surface. So rust converter pumped in!