I'm not sure of the prices these days but when I built mine it was far cheaper than the Omni version for several reasons.
The chinese Generator (loncin) was available elsewhere for about £370 whilst Omni were pushing the same one out for something like £650+.
I used Superlight poles which meant that I gained a Superb wfp at the same time as having a very light vac pole. In the last year Superlight sections have almost doubled in price.

I made a camera system from Maplins and a few bit's (battery pack) that I had around the house for around £120 I think. Omni camera was around £800 ish but far superior but not needed for my kind of work.
I already had a trailer to bolt my Generator in.
I sourced and made a heavy duty extension lead.
Most of my system was built as Mr H's post that pops up on here from time to time so mine is pretty similar except I stuck with 38mm hose rather than 51mm and made my nozzles from wc waste pipe.
You would need to check on prices because things have changed since then - even cheaper vacs are available from Eastern Trading I believe and of course the lower powered ones from Polarvac (Numatic) can be used.
If you remember the basic design is simply a Vacuum cleaner and a pole, then to make one is soooooo easy its a joke.
Most Generators of that size - 5kva have the option of 240v or 110v
I don't pressure wash driveways etc so I use an electric powerwasher (Kranzle) and a second hand telescopic lance now and again for blasting down s bends and sometimes for gutters and brackets. I haven't had to clean any gutters above three storeys and to be honest wouldn't want to use a 48' Superlight at that height let alone heavier aluminium poles.

Probably worth chatting to others on here to see how they do it, I'm no expert I just use what seems to work for me for my particular area. I don't really push the gutter cleaning too much - it's more for my existing window cleaning customers - it always felt very awkward telling them "no I don't clean gutters"
Don't forget Ladders come in really handy too
