I am a tad confused about these. I have an old kit purporting to be of the MCV. The kit has a 9' WB underframe of the 90 degree beam type. Also two vacuum cylinders.
Here is what I got with the kit:
Yes, my copy is cut off.
Two very indistinct pictures of 8 clasp and 4 shoe examples:
This picture shows a ruined underframe with an angled arrangement of beams: https://paulbartlett.zenfolio.com/brmineralclaspvb