I often take the 2x10 and amp, only used the full 4x10 and 2x10 a few times... But I have invested in a decent trolley!
But my cabs are Markbass - the 4x10 is a relatively reasonable 25kg.
His shop was where MyDentist is now. He sold Akai VHS machines and rented out tapes - remember Jock getting Cannibal Holocaust and I Spit On Your Grave from there, my dad had no idea of the content! He only had the shop for a couple of years before getting sick of it, probably by beginning of '83.
And the Private Shop was where the Caspian is now - had a black front. And it moved to Brook Street later. It's probably a barber's now...
Keep the 2x10, but buy a 4x10 of the same make and impedance (assuming it's 8ohm). That way you've got teh option of a 2x10 for small gigs, a 4x10 for medium and effectively a 6x10 for big ones. That's what I do!
Not being a fan of to-the-note-and-word covers, I'd say do it, but make it your own. Put a spin on it, a different feel, different instrumentation, whatever.
But don't copy it. Copies are rarely more than a shadow of the original.