New to the forums, not new to CL or some of its basics, I love this mod pack, its really tested what I know about the game.
Making seared bricks is simple really, just takes time and LOTS of those small stones BUT, once you have a cobble gen or lava source and an AA, then build a vanilla STONE gen or make stone in your furnace. Hammering stone gets the small stones, set the AA to pound out the stones over the hopper, place stones in crucible, Block Placers are cheap help too. It will take many stacks of stones to do it but it is possible. Also, you just need enough bricks to make the controller, the tank, the drain, and a casting basin. After that just sear cobblestone in the basin until you have enough to make the smeltery.
The fun part is getting the water to make the bricks to make the high oven....