19th March 2022 Measuring using my new measuring gauge and very easy to use to !!
The measuring showed that I needed to take off 1.5mm from top and bottom. The photo shows the face for the ports milled to size.
An the other side is brought to size to the plan's dimension of 2" top face to bottom face
To machine the two shorter ends the setting up was more difficult so I decided to use an angle block and braced the piece against it
Before taking the final cut for that side I checked for squareness to the bed and adjusted accordingly. It was only a little off so a tap or two with the soft hammer put the right and the final cut was made. It was then turned over end for end and the other end machined to a base level. This is now ready to be marked out for boring !!!
20th March After a chat with several friends it was the marking out prior to boring the cylinders
If I thought the maring out took a long time of double checking the setting up took even longer and is being left over night so that I can check again tomorrow. I used a DTI to check that the block was set parallel to the saddle .
21st March Whilst the setting up shown above was fine I decided to put a piece of paper between each of the metal  surfaces to try to ensure no movement. The gibs were also tightened in the saddle so that no lateral movement would take place until the end of the boring of the cylinder. This photo show the first bore with the new boring bare.
Progress on the second bore
To ensure that the boors and the surface for the end caps is a right angle to the bore that surface was fly cut without and change in the set up.
Te photo shows the two borse and the facing off all completed. All that remains is to bring the block to length which will be done in the milling machine.
Now the cylinder block is milled to size.
23rd March So the cylinder block was coated in marking out blue and the position of the ports marked out and cross hatched so that there should be no mistakes.
24th March The vice had previously been set square to the travel by using a dro so now we can porceed with the set up ready for cutting. This is my setup for machining the various ports. Note the two machine clamps which are acting as stops at the end of each cut.
With the plans silent on the depth I measured the distance from the top to the bore and then reduced that to 6mm as the cut depth. A stop on the depth was adjusted and also the DRO set to zero. The cuts were made very gentle as the cutter was only 5/23" slot drill.
25th March Machined the steam inlet ports  They may not be perfect but are very close !!! To help me in the future I have bought a DRO from RDG Tools !!!