I'm pretty sure I've downloaded a trial of Hugin in the past, but I found ICE much easier to use!

Unconverted the K100d works better than the K7, but that's because of it's weak hot mirror. Conversion removes the hot mirror so the K7 would be significantly better.

It is possible to focus without the filter on & shift as required for the change in focus. It's not too awkward with many older lenses (which have IR marks) but LV is all round easier.

There is this one http://www.ebooks4cameras.com/Pentax-K-30-e-book-K-30.htm
I had his book on the K100d which was a great improvement on the manual. Never got the versions for my later cameras though.

Unfortunately the one I've had for ~30 years is only the plain version. It got used a lot when I was shooting film.

+1
I've no shortage of lenses covering the 70-210 range so I'd not even have given them a second look, but I know a Pentax user in the market for a cheapish macro.
My Miranda 24mm/2.8 works adequately (and was only £5) though it has a Ricoh pin, it's smooth enough not to cause issues,

I've heard of people using converted cameras getting pleasing results doing a CWB without the filter, but with the filter is far more common.
FWIW paper, grey card, PTFE, concrete & the sky have all been used for IR CWB of one sort or another, giving different results but all perfectly legitimate.
If your using an unmodified camera a CWB without the filter will be TOTALLY useless, the visible light seen during CWB would swamp any trace IR signal which is all that will be used for the image.

From the exposure times Derek is getting his K3 is unmodified. Doing a channel swap with a R72 & unmodified camera will give you everything blue, as over 99% of the trace infrared normal cameras can see is recorded in the red channel. Using filters below 720nm on unmodified cameras generally just record the visible portion that the filter transmits with no IR being visible.

You could be right as there's a 'Best Premium Camera' that separate from Professional DSLRs/Mirrorless. Perhaps Premium means overpriced/snob value in this case

I'd not noticed before but does anyone have any ideas why the 'K-m White' needs a different manual to the other K-m models??

If you want low light performance the K5 is a big improvement on the K7, but if the K7 is sufficient for you mines currently available for £130 body only (thanks To George tempting me with his K5-II).
I'm in no rush to sell though having a spare body in the draw at work is proving useful

Only if you believe the Met Office.
Until the Met office revised their description of spring it was always officially the period from the Spring Equinox to the Summer Solstice (both dates determined by the way the earth moves round the sun rather than an arbitrary calendar).
With this truer definition of spring Pentax have got about 10 weeks, before they can be accused on failing to meet their Spring release.