Hello Cabinetman
Since you've got a well equipped workshop already, including benches.
Putting fun aside, what do you wish to achieve...
Could it be another bench for space/different projects?
Is there anything which the wall mounted benches can't do?...
The only thing I can think of is for heavy and large projects which you can approach from both sides, as likely easier with an island bench.
You have got assembly tables also, so sounds like you've got a on everything you need.
One could think of the show piece aspect, it would make a nice addition to your page, business card or for ads.
I'd personally be looking for the trickiest things you can remember doing, and focusing on seeing if that job can be made easier, should you not have figured out a better way to do that job half way through it already
Do you have enough infeed/outfeeds, I made a sharpening station to suit, in addition to the bench for that need.
The workbench book is a nice read if you can find it,
there's things like a double tail vice, and likely the most unusual benches you might find.
There's some good ideas on it too, not just super specific crafts.
There's a good "the workbench" section on the Auzzie woodwork forum too, worth a look.
If you like Schwarz talk about benches, then you might enjoy this.
https://www.youtube.com/watch?v=8fY5szcZEDoFor the really really really obsessed,
there's a thread called "workbench smackdown" aswell as a part 2 on a lumberjocks page,
but it would literally take about 3 or 4 hours to get through part 1.
Hundreds of benches, you really do need a pen and paper and fast internet to make use of it
To be honest its mostly Roubo types, but in differing timbers.
Depending on your opinion, you might be better off not spending a full week to get through these.
especially the workbench smackdown thread.
Curious to see what you think might be the most difficult operation to do with your setup,
I suspect it's catered towards a good few paying jobs, which crop up often.
All the best
Tom