Unless you get one 100% complete I'd think about doing something easier - just my option tho' and saying that I love a challenge. I helped out on a resto of one quite a few years ago and parts were hard to find but there was no www back then. The headset was a weird tin two part thing which didn't inspire confidence and we ended up widening the panels and put a P range motor in and changing the front hub to take a 10" wheel. So not really a resto in the end but seemed like a good idea at the time! It maybe easier to find parts now - good luck!
Are okay. That's good too know. I've just finished an et3, and looking for another project over the winter. The one I've been looking at has been stripped down and in bits. Originally to be resprayed and put back together, as t he bloke said it was running upto last November. but by the pics I've seen it needs New floor strips and New rims and tyres, New speedo.
the headsets are very hard to come across as they were a split 2 piece design like the px's and over the years they get lost. Some engine parts are hard to come by too..... usually carb and airfilter and airbox iirc.
id go for something like a vbb etc but as rob said depends on what your after/want it for?
an original resto and show piece or classic looks with a px engine for a modern classic or totall custom etc
The usual answer is somewhere between what the seller wants for it and what you want to pay. Based onthehistory of the sale no one wants to pay a grand which seems right considering there's another £800 for strip n paint then maybe a conservative £500 on new replacement parts and re chroming. Then there's the faff. Because I'm mean like that and because it wasn't a popular scoot I would say it isn't worth what's being asked now but I'm neither a collector nor an enthusiast for large frames except an SS180 or early GS.
If i had time only hands I'd think about re-coaching/styling an auto but there's always the option of making a repro SS 50/90 - you've other xperience of the ET3 under your belt and they are much more fun than the 152 which is so lardy that IMHO just looking at it thickens your arteries off the scale. Just shooting the breeze tho- 'sup to you. Good luck