The colour of the water in the basin needs to reflect the colour of the imaginary sky above. Water is by far the more difficult of the two for me, so I really must have a go. Painting the backscene to tone with the water has got to be easier than the other way round.
My experience of modelling water comprises some solvent-encrusted string for an N gauge waterfall (not very convincing) and a modest pond in H0 (better). I have never tackled anything like this basin in my life.
Local knowledge tells me, the water here always has tiny ripples on its surface; it is never completely calm. I have done some experiments with a large offcut of rippled PVC sheet over intense blue-printed photo paper kindly supplied by Clyde Humphries of Magnorail Oz.
Experiments with different spray adhesives pointed me towards a light application of Gorilla brand glue onto the photo paper, a one-minute wait and then assembly.
Sadly the "real thing" did not work out - the joins in the photo paper and in the pvc sheet stick out like a sore thumb.
I know, used too much glue but I can correct this next time. I am sure this PVC sheet is a good idea but at the moment
I am seeking a large sheet able to cover the area in one piece.
In the meantime, I have build a "cover assembly" to raise the basin to its proper height.
This is simply a sheet of black foam board braced with stripwood.
The foam board tucks underneath the edge of the basin. I will fix up the gap in the bracing if I think it is really necessary but a little flexing helps installation and removal.
The result looks so good, I might not bother with any water at all!
I mean, whilst the cover assembly gives me a space to install a Magnorail mechanism to drive some swans, I could equally well cut out the foam board to install a display panel, nicely angled for viewing.
The cover assembly leaves me about 1.5 mm to install a "water" layer of card and PVC sheet; but without these, a few shims will raise the cover tight underneath the basin edge. My options remain open.