10X10X10 times the volume of optical glass would almost be measured in Tonnes. One potential problem was too much eyerelief. Besides being difficult to use without a special eye positioning cup, this increases the diameter and hence thickness of the eyelens elements unnecessarily. Simple geometry dictates that an 80 degree field of view with 100 mm eyerelief makes for a huge eyelens. Although some ideas were forming for an El Cheapo version using discarded optics, I could not resist the temptation to scale up a common wide field configuration.
Computer time is cheaper than purchasing and pushing glass.
A traditional 212 configuration Erfle was chosen because this type has inherently small eyerelief. A decision to use more common glasses was taken although this results in thicker elements and lowered performance. Yes, it was possible. Field could be 70 degrees. Most of the elements were 30 mm thick and very steep.