I'm almost Finished

You could go with either the tung oil or the sanding sealer first. If you are using a tung oil that lists petroleum distillates on the label then it is a tung oil, varnish mix. This will produce a hard topcoat finish. If it is 100% pure tung oil this is a penetrating finish that will produce a relatively soft topcoat to which you may need to add a protective topcoat, if you want. But the sanding sealer should be added first to prevent blotching if you are using a tung oil/varnish mix.

I have only used Miniwax’s polyurethane/stain product that is sold under the label of polyshade. It is a product that I have found difficult to get a good finish with. The problem with applying a sanding sealer and/or tung oil is that if your intent is to color the wood then these will seal the wood and your staining may not be effective. These are really designed to be used on bare wood.

-- With God's help all things are possible- even woodworking. Woodworking is not just a hobby, it is an (expletive deleted) expensive hobby.

Questions: Do you have enough cherry to do the entire vanity? Is the plywood cherry? Can you use the fir as a secondary wood where it will not be seen? If not, you could wrap the fir in cherry there by gaining cherry legs. Also if one side of the vanity will be against a wall, you could just use an upper and lower cleat of fir to screw into the studs. Just my 2 cents.

-- Rick

You can do both things at once, applying the Tung oil with a scotch-Britte type pad, I recommend to use Pure Tung oil.
As the pad is abrasive, it will leave the wood smooth. Just make sure to get the gray ones (woodcraft) since green ones (cleaning) release the green color on the wood.

-- Francisco Luna, San Francisco Bay Area.

I have used the scotch-brite pads in the past, both green and gray and you are right the green do leave
particles behind.

The legs, two and a half of which will be seen are compound curve that I emulated from the WoodWhispers l
Leo La port Gadget Station. The tops are not angled though. So I am going to Kregg the legs to the plywood and make the face frame and other parts from the cherry. The two front doors will be made of cherry and plywood substrate for the amboyna burl veneer I am re sawing for them.

Hope none of this is wrong cause it’s what I got to work wit and no more $$$ for NeoDon as the Job is about to let me go and, well no more cash says the Ladie. “My Beautiful Wile”.