Hi Rod
Great report!
However, regarding your comments about Loch Arklet, I think you have mistaken Loch Lomond for Loch Arklet!
One of your super photos shows Ben Lomond very clearly and and the Loch below right is Loch Lomond.
Interesting to compare your route with ours!
Ours had more ascent but almost formed a horseshoe (of sorts).
Yorjick (Steve)