To confirm modeling, we weighed the Assembled Stage0.
The 1250#s does not include the Spring posts which some might include in the assembly but we didn't have them mounted.  It does include all the bolts clamping the plates together and all helicoils and dowel pins.  It also includes the three 1/2-13 lifting eyebolts.
The design weight is 1242 so we are right there.