I'm full of admiration for the folks who build those huge structures shown on the Linka World website, they either have immense reserves of time and patience or a truly prodigious collection of moulds!
I'm building a retaining wall with arches, in the classic style, and thought I'd use Linka for it. Twenty spans or thereabouts, and I can cast maybe four or five a day. I'm getting better with practice but it's clear that the more pourable the plaster mix, the better the result, but that also takes longer to be ready to remove from the moulds. With a good pourable mix I reckon at least two hours before it's safe to separate and then 24-48 hours to cure. Plastikard glued to plywood is a lot quicker! Sadly the brick sizes are different enough that you can't really mix the two. Never mind, modelling is as much about the building as the finished article, eh?
On the subject of Linka, does anyone else here use it? Any handy tips to share? The moulds never seem to be quite flat, I guess the mortar grooves are deep enough that a very light application of wet & dry to even things up will not do any harm. Guy