Doesn't need to be a star frame, any 05 (probably 06 too) ego frame will do but as said before it's really the FRM where the issues lie, taken me 5 hours to machine that FRM and probably another 8 hours by the time it's finished and anno'd.
Don't use the centre screw, unlike a normal ion the 5.1 doesn't have a rotating doughnut so that screw actually does something.
You also need to consider the board and which noid to use.
Certainly not a cheap way to make an ion, probably £400+ without charging myself any labour.