I'm sorry you feel that way, 'Freddie'. You didn't actually offer advice, in your '8 minutes later' after my OP post, did you? You asked what was obviously a goady, stupid question- what did I mean by 'glass'? I then readily explained that I didn't want to get sidelined- thus get ignored by sensible responders. I asked about channels, not glass, didn't I? I didn't want to drive away responders who might think 'Ah, already derailed by a troll', time to walk away. That would have been counterproductive.
'Glass' is the stuff that surrounds you when you have a shower in a bath tub. I am struggling to see my 'obsession' with 3mm glass, versus what I now know to be better, 6-8mm. It isn't hard (or is it?! Glass generally is!). But I was trying to avoid the goady "explain what you mean by glass, tempered? shatter-proof? laminated? how thick? Hmm?" demands - I didn't ask that question here on DIYnot. I trust the glass/acrylic bloke I use to professionally inform me about that, along with sensible responders on here (many thanks to those who have helped enormously).
Sorry that my inverted comments blinded you to my question. I did not mean to confuse you so completely. What still does confuse me is that, apart from your reference to 'obsession' on my part, re 3mm -ahem- glass, your later response was useful.
Why not approach that as your first, considered response?
For the record, wimmins forums, like Netmums and Mumsnet, would have made mincemeat of your latest response! You'd have to be far quicker on your feet than "some kind of cock".