[Track Saws]

I've got a Makita and a ts75 I probably use the Makita more because of weight. I also have a Festool 55" and 75" tracks plus a Makita 118" track. I use the 55" for cross cuts on 4 x 8 sheets 55" on 5x5 and the 118" on 8' sheets. I have no real desire for a battery saw because I always use a vac so I have a hose anyway 

[Angle of a cut]

Domino

 

[River top desk]

The one I did I cut down the middle and turned the live edges to the center.. If you did it that way you could add to the saw cut edge to get the width you want

[Bedroom Door]

I'd probably mill a filler strip to take up the gap, or make my own casing for inside of the room