Holding a nut in place inside tubing - GIF

[Toolmaker51]

Toolmaker,
When you get it set up properly, bolt it down with easy disconnect system, I'd imagine female Dynabolts or such, to allow flush mounting. Locking castors won't stop movement or damp vibration. There are expensive castor/platform attachments, but they have the same problems.
My 12" Wadkin clone (~300kg) does not require solid fixing, but all of the 'contractor' or compact saws need added mass to work well. And invest in a GOOD blade, or 3, Rip, all purpose, and fine cut- off. And make up a baffle system or box the base in (plywood) completely, airtight as possible (foam weatherstrip), and connect to, at least, a shop-vac. Irwin's range of blades are a good, readily available and quite suitable for a saw of that size. Hope that helps. Any questions, feel free to contact.
Jim

My inclination might be attach a 4' x 4' plywood deck, that'll add my incredible 157 pounds of bulk, with short shag carpet 'feet' underneath. Shape of the stand, isn't a slam dunk to enclose, but it will be none the less. Stop at local hardware didn't strike me with a great range of blades in correct size (or at diameters expected).

[Beserkleyboy]

That'll work, too. Many a small saw have been 'inserted' into a bigger table. Consider making a full height box base, so it looks like a cabinet saw (think UniSaw). The more you bulk it up, the more it'll work like its bigger cousins. Where are you located? Our 'big box' store, Bunnings, keeps a decent range for that type of saw. Maybe Home Depot or Lowes.
Jim