The key to this mod is the Architect’s Sawbench. This holds all the templates for the type of blocks you wish to mold. Simply add the desired block to the top slot and pick an option on the right. It will yield varying quantities depending on the shape you decide to craft.
And you can add rounded pillars to any of your elaborate buildings.
Possibly one of the neater aesthetic but functional features are the hand railings. Most often stairs will typically go without railings or with bulky fences that take up an entire block space. These railings will fit right at the edge of stair blocks, taking up significantly less space while also preventing unnecessary falls.