There's already some hybrid 68020-030-040-060 core in the FPGA Arcade.
No need mess with proprietary cores with requirement for specific FPGAs. Nor any Coldfire incompatibilities.
A practical issue is that due to the
through-hole nature of the 68060 PGA socket any PCB will be occupied by solder pads from the pins. A solution is to put double row a straight pin 1.27 mm header around the PCB edges. Such that a another PCB can be mounted on top and the space be used for FPGA, DC-DC and EEPROM.
A plain PGA-206 socket will leave approximately 20.3 x 20.3 mm and the
XC3S1600E -
FG320 used in the
FPGA Arcade uses 19 x 19 mm which leaves a margin of 0.66 mm around the edges. Tight! And ofcourse there's then no space for the DC/DC and EEPROM which is essential for operation.
Btw, it seems perhaps x86 motherboard
"Socket 3" fits as socket for 68060.
FG320:
PCB stack (illustration):
DC/DC (illustration):