Digger, it's me again. After I closed the above words I went looking for some restored pics..
If you want to see what your Perd fix might look like, there is a very close example of size and basic design on Randy's pay dig { front page, right side link ] Click "page 6" then left side of first pic.
While there, scroll a bit further down, there are two Gomer examples that Randy states where 50% restored so there could be hope for your 75% hail Mary ! !
What county were those dug Dan? The base of the Castroville looks strikingly similar to one I found in Kerr county a couple weeks back...almost to the point the same guy made them.