The 'W' quality is ok as far as things go in the rv world. If you plan to remove the dinette, take into consideration what is underneath your dinette , like a furnace or whatever. If that's the case, then ripping it out to install chairs might not be doable.
I see the floorplan now and didn't realize your dinette was in a slide. You should be ok to alter it. Sofa or recliners would probably work just fine. You might just lose some underneath storage but your comfort level would be real nice.