Here's where I'm at. Grateful for any advice though !
https://imgur.com/WScDe4b
In the photo, I've put a couple of screw jacks with pads under a bit of tension between top brace and body bottom. Doing so allows me to insert a couple of very thin maple pieces that didn't slide under otherwise, but were close to doing so .
If I release the jacks the pieces bind. It should be OK then for applying say Titebond to each side of the maple pieces, slide them all the way under and release jack tension.
Just not sure though if these will slide all the way back as they're a bit fragile to do a complete trial run.
I dont want to apply any more jack pressure if possible, so maybe I should humidify the body for 24 hours and see if the gap opens up a bit more ? But maybe then the release of jack pressure wont close up as well on the glue !?
Any clues please ?