Hi John,
I am currently building a Bassett Lowke 1.5" traction engine that was started by my father about 40 years ago.
I have all 5 drawings but they are rather fragile and not verry good quality so I have scanned them in as a series of A4 scans and stitched them back together using Photoshop. I can email a copy to you if you want but the drawings are not totally accurate and don't give much detail for some parts.
Sheet 1 is the general arrangement and doesn't appear to have been revised compared to the others because it shows a different firehole door to the detail on anotheer sheet.
There was no construction booklet original produced, unlike the 3/4" scale Bassett Lowke TE so you need to have some knowledge of model TE construction. I have an old set of the Plastow 3" Burrell drawings which I use for additional information as it appears to be very similar to the Bassett Lowke Burrell.
The other thing you need to consider is that the original boiler drawing shows an all copper rivetted and soft solder construction with integral hornplates which isn't really acceptable now. I redrew the boiler to be silver soldered construction with separate steel hornplates and had it made commercially.
If you want any more information please let me know.
Richard