My trouble with 'fieldstone' is that it more accurately resembles 'riverstone', as can be seen from a simple 'google'.
The HA fieldstone is a great 'Fantasy Art' product which is very versatile - give Bruce his due credit. But it just doesn't hack it for me.
The 'chipped stone' is something I've never seen in full size real life, but there again it is 'Fantasy Art' and fills a purpose for it's intended market.
Linka stone pieces are a much more realistic representation of ONE type of stonework - a bit like a flatter version of Cardiff Castle. But the scale is all wrong for 28mm. BTW I wonder when they intend using silicone instead of rubber for injecting - Now that would solve the 'tabs problem'.
One thing that I didn't realise until my wife got here is that Americans just don't understand Castles or stonework. We live in an environment littered with Victorian terraces faced in stone. We also have Castles all over the place. The nearest most Americans get to this 'immersion' is Hollywood or 'doing Europe' on vacation. Please don't take this wrongly it's not an attack on America, just an explanation of the difficulty.
When my wife got here I took her on a drive down to the centre of Cardiff to see the Christmas lights. The main road in passes by Cardiff Castle. As soon as she saw it there was a shriek of amazement 'A CASTLE!!!'. She still can't really get over the fact that it's slap bang in the middle of the City. This was the first Castle she'd ever seen close up.
There is a difference in the way we look at things. However much someone who hasn't lived with stonework tries to envision a size reduction they find it very difficult to understand the way light falls and the variation of shadow. Particularly the of **White** mortar in real life castles.
We have been very lucky to have grown up living amongst this history.
I recon you could adapt that stone wall for casting.........
All the best,
Jon