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Fairly sure thats just a normal frame with a trike kit bolted on (I think the trike kit is a consumer product, not heath robinson DIY)
Worth a look if the frame is your size (looks tiny). I'm sure some nutter would buy the trike gubbins. Must be very rare.
Bars must be worth a bit. Assuming they're Scott Drop-in 2s
He might even have the original forks knocking about.
Might be a Carradice on the front too.
tallsam-
Agreed - great spot on the bars!
Curiosity got the better of me and I did a bit of digging, the conversion kit looks remarkably similar to this: http://www.roman-road.co.uk/conversions/, a nifty bit of kit and a snip at £1,400 whenever the website was published (at least 2015 - despite appearances - according to Wayback Machine). Bit of a tangent but it turns out trikes with two wheels on the front are called tadpoles. Even bigger tangent but Roman Road also led me to this insanely brilliant tadpole trike Brompton prototype! (Interesting story behind it here)
As for buying it, I was scouring for a touring frame from the likes of Longstaff/Bob Jackson/Mercian/etc for ages, and came across loads of awesome trikes/trike conversions and tandems along the way. I've been trying to be sensible and not buy loads of kit to split and sell on though, which has thankfully finally paid off with a rather lovely mid-90s Bob Jackson Super Tourist frameset with all the fixings, plus some nice bonuses like half-chromed forks/rear triangle and double box lining, so am all good for now... As you say though, this would make a great project for someone.
EPR
Absolutely bonkers Bob Jackson trike with its two wheels on the front (?!) in Acton.
The steering set-up looks a bit Mr Bean and the whole thing looks like a somewhat bodged conversion but it's only £250...
https://www.gumtree.com/p/bicycles/3-wheeler-bike-bob-jackson-/1370026602
Always wished I had the room/more importantly, the use for a trike.