Thanks @Mr.Shenanagins and @Jayefc1, and @alto your kind words are much appreciated.
Yeah, I guess you're right about that but it'd get lost in plant growth eventually and I thought it relatively insignificant and therefore unnecessarily complicated. The problem I have is the hardscape is really too big for a 60-P it would perhaps be more at home in a 90cm wide tank where I could add a more substantial rock (that wouldn't get lost) and still maintain balance. But I was determined to use the root anywayBut - if I’m allowed a but - I do miss that second rock, the wood looks precarious without that supporting stone
though obviously this will disappear as plants grow in (hint: a tangle of vines )
The smaller of the two, M. crenataWhich Marsilea did you choose?