I do agree that without some support under the machine platform you would need a full torsion box. You can get around this with a load bearing divider like I implemented. You should be fine since you will have to have something there to mount the drawer slides.
Also I’d be happy share my 3d printable lift off hinges are f you’re interested.
@DiscoJon - Yes after seeing your divider that is true it gives support across the center I might switch to that but… @CrookedWoodTex - I have never built a torsion box, can they be off centered and not straight in line like a checkered box to where I can still Brad nail straight on and get the same support?