As I don't have any metal working equipment, and only a few hand tools, a wood based vice made sense. Also, the wooden clamps I made a few weeks ago have performed so well that they seemed to be a good base for the project.
Step 1: Tools
A bench hook (home-made)
Two wooden clamps (home-made too)
And a sharp pencil
Step 2: Materials
The threaded rod is M6 and so are the nuts and washers - this should be plenty strong enough.
Step 3: Cut the stock
The clamp rails are 30cm x 2.5cm x 4.5cm
The MDF face plates are 14cm x 18cm x 2cm
The front rail is 18cm x 3cm x 2cm
The studding is 14cm and 24cm
Step 4: Drilling the main rod holes
Also once the first hole is drilled, thread a piece of studding through the sandwich to ensure the second hole will be true.
Step 5: Assembly
After assembly the front face was sticking so I've widened the holes to 9mm improving the travel.