Looks good so far. Cobble is one of those blocks that depending on the building can look nice or hideous.
If you find yourself in another cobble surplus try building a castle. At last count I had used 12,468 cobble that have been smelted into stone for the walls and 648 more cobble for the foundation. A few thousand more to build the towers and start the roof and I had to go dig out my 35*32*40 mob grinder which left me with about 11 double chests. I think that should be enough to finish it. I hope.
Make tools and make a quarry 60x60 to bedrock (so you can eat up cobblestone) or smelt it for xp and then make a mob spawner or fill holes of ores to waste cobble(which there is waay too much of anyway)
In my previous world I realized the value of dirt and cobble. It might seem like it's just crap you can throw away, but the day you need lots of stone brick for building projects or dirt for terraforming you'll regret it.
Just build a dedicated house/hut/chamber underground or something for cobble and dirt storage.