you want food grade. 190 proof. you’ll need a still at whatever scale you want to play. I figure 1gal 190proof EtOH per lb biomass. you can reuse your solvent on fresh material to a point. depending on biomass potency.
if you can only get 100proof vodka, or even just village sourced corn/sorghum beer, you can use your recovery still to bootstrap your first batch of solvent.
you may want a press to get back more of your solvent. so you don’t have to brew extra solvent every time. you’re looking at 10% losses each run with just gravity drain. possibly higher in your ambient temps.
the Romans had some great presses. so low tech isn’t an issue.
https://www.google.com/search?q=roman+wine+press&source=lnms&tbm=isch
Bonus points if you can do a solar heated vac assist still, and get the vac from a stationary bike and a $20 vac pump following this example
I’ve got a local solar water guy who might hook you up with a design if you make it by Eugene on your US tour…
You can ponder this setup…
Or even purchase an off the shelf unit…
http://solarstill-co.com/store/solar-ethanol-distillers/solarstill-10ec-solar-ethanol-distiller-compact-kit/