Yep, agree that seeing both sides from underneath the wheel arch side if possible is important (in my limited experience). From the engine bay of mine, both sides looked just as clean as in your photos, but as I noted in my new member post, the nearside rail was actually quite rotten, and that could only be seen properly from the wheel arch. This is a good angle to see the full story:
Wasn’t bad enough to stop me buying it, but obviously took it into account in the purchase.