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 28-Build 3110 USA FULL
Windows 11 Prof (64 bit) - Intel i9-14900K CPU 3.20 GHz - 64 GB RAM - NVIDIA RTX 5000 Ada Generation