It now says "Closed" but I don't if that means sold or withdrawn from sale.
The rather aggressive rhubarb, sorry, rubric, suggests the seller originally bought it without really understanding what he was buying, not what would be involved in rebuilding and finishing what appears freelance and never completed..
Hard to tell what the boiler, apparently with a single, rather small flue, is under the cladding, nor its actual condition though I'd certainly cast a very critical eye over it.
Chain final drive? It looks like a sprocket on the axle.
I have known a freelance engine of roughly 3" , perhaps small 4" , scale, made that way years ago; and have no idea where it eventually went. Scrapyard probably, which sounds harsh I know; but it was very roughly built, with a chain-drive to rear wheels from an old car, tyres and all, accompanying a boiler I doubt anyone now would trust although its builder did try steaming it; with little success.
I am sure this e-Bay one is not a partial rebuild of that engine I knew – it looks a lot better made, or at least looks a lot better, for a start; and the other did have a multi-tube boiler.
Nicely painted, if nowt else. That seemed to have been his selling-point!
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I have seen some forlorn wrecks over the years – some begging adoption for completion or overhaul into service; others perhaps best buffed up as ornaments; some well, sources of parts? Each once somebody's dream project but cut short by the owner's own loss of interest or money, or by illness or inevitable re-allocation to a rather Higher Running-shed.
The saddest though was a brand-new boiler, beautifully made as Part One of the retirement project of a professional coppersmith, faithfully to the drawings. He had brought it to us for a test; having proved it did not leak by his preliminary test. We inverted it on the bench….
It was faithful to the drawings all right. Drawings of unknown provenance by someone unknown, who had clearly not known a 3.5" g loco's LNER-pattern arched firebox in copper, needs a lot of stays everywhere to withstand even the cold hydraulic working-pressure test by the builder.