should be around 20,000 polies per limb. If it is to complex game guru will not render it properly disregarding faces, and the collision will be messed up.
If you build it as floor as an object, walls as an object, columns as an object and so fourth, them you can control collision a bit better and the parts should all insert at the same location aligning it perfectly.
May take several pieces to put it together but will be an easy build in Game Guru maybe 5 minutes in placement.
Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz, 2400 Mhz, 4 Core(s), 4 Logical Processor(s), 8gb RAM, Nvidia gtx660, Windows 7 Pro 64bit, Screen resolution 1680 x 1050.