Combi Mill Pro 3000 conversion

I have a Combi Mill Pro 3000 vertical mill that I am planning on converting to CNC, the mill used to have cnc control, so has ball screws but has been converted to manual.
I also have five SEM MT30F 4-45 DC servo motors and mountings from a bridgeport conversion (I think it was an Anilam conversion). The mountings should fit the Combi Mill as it is a bridgeport clone, but a bit bigger with a 54" x 10" table and ISO30 taper to the spindle.

I would like to use these motors if I can.

Looking through the posts on this and other forums it looks like I can use a Messa 5i23 with two 7i29's

Is this the best option? and what do I need to do about encoder/tacho/resolvers? The motors state Tacho 9.5V/1000rpm on the data plate.

Also any suggestions on power supplies for the motors?

I am new to the world of CNC but I have some background knowledge of electronics. I am based in the UK.

Thanks in advance for any sugestions.

Thanks for the replies.

I thought that encoders would be the way to go, do you have any suggestions on sources and type?
I like the idea of the builders transformer, but my motors are 140V, I cannot remember my transformer theory will the voltage be too high?

I have looked on both messa and pico websites but I think I still need to learn a bit more before I take the plunge.

I do not have any parts of the system apart from the motors and mounts.

Thanks

I have looked at my motors, the connections they have are:-
A1 & A2 - Motor
T1 & T2 - Tacho
K1 & K2 - Thermal Overload

so they do not have any encoders.

I have had a surf on Ebay and there seems to be quite a selection of rotary encoders on there e.g.

www.ebay.co.uk/itm/Xinya-Increament-Rota...&hash=item4167d3adee

or

www.ebay.co.uk/itm/T1-Line-Seiki-Rotary-...&hash=item35ad812c64

are these the type of thing I need and what sort of resolution will I need.

Thanks