We use Isokern all the time. A colleague of mine made up all the pieces and we now just use them and put the "puzzle" together. Talk with your rep, you can custom configure the Isokern product and create some large fireplaces. To make the pieces, just check the catalog out and generate them per the dimensions provided.
Robert J. Garand
ArchiCAD USA 27-Build 5001 USA FULL
Windows 10 Prof (64 bit) - Intel i9-10920X CPU 3.50 GHz - 128 GB RAM - NVIDIA Quadro RTX 5000