About this 3D model

This is my first attempt at designing a heater block for the mk5/6 extruders that will accept a .25"x1" cartridge heater. There is also a spot on there for a 250c thermal switch (Microtherm PN 55H12T944). The thermoswitch is rather large so it may be better to use a thermodisc part such as PN G4A01240C which is much smaller. I don't have my cartridge heaters yet. I'm just uploading this in case people want to give me their input on the design.