Want to replace drop leaf table top with solid top but keep base.

Very doable, but you don’t mention what type of top you would be using. If you are planning on granite, quartz, marble, etc. this is quite simple to do. After removing the existing top you would add cross pieces lengthwise, about 4” wide. These need to be flush with the top of the base. You will need to plan how to keep any fasteners from showing on the outside of the table base. Then apply a generous bead of silicone caulking on the strips you installed. Place the new top down and slide it around a bit to distribute the caulking to a large area. Make sure that you center it so it will stick out past the base an equal amount sides. If your new top isn’t heavy you need to put some heavy items on it.

Don't spend too much on this project. You can look at thrift stores lots of tables without chairs as they break ad are discarded. You can take the top from another table and replace it onto your bottom.

We did this to my table. We used a piece of 1/4" plywood for the base and trimmed the sides with wood trim that had a carved pattern in it. I painted the side trim. Now this is hard to believe but, it turned out beautifully. We filled in the top with flooring. It's the kind that you can't hurt and it's a blend of browns, grays and a touch of black. It will blend with any wood you have in the room, going from light oak to dark walnut. Everyone asks where did we find that beautiful table. It was so easy to do. I made it wider than the old one to allow more room. Just an idea.

You could make a cement top for your table. This might not be the vibe you want, looks like your home is very traditional. I made one and then waxed the top, it is really beautiful.

My table is square, now. It had rounded corners but, we squared the off the edges with the new top We attached the side trim with brad nails and secured the top with screws and glued the floor planks. The old top was slightly damaged so it didn't matter. The trim was wide enough to hide the old table underneath. The pic with the trim was taken in bright sunlight but the trim is black. We did it in a day except the trim. I painted the trim before we attached it and did minor touch up afterwards. It's about 2 years old and no problems at all.

P.S. I'm going to paint the last two chairs black. I have four done.

I would use 3/4" cabinet grade or Luanne plywood for the table top. I've used 1/2" on projects before and regreted not spending the few extra dollars for the stability that 3/4" offers.

As we use 3/4" for SubFloor in our mobile home, we know it holds weight without bowing. With plywood you can cut it to any shape or size the 4' x 8' sheet will allow.

It leaves you open to keeping the wood look with stain, or you could paint it, add a stone or tiled top, or even the concrete that was earlier sugested.