Pete
You will find this a very rewarding kit to build resulting in a very accurate 7mm A3. As you have already noted some etchings are quite thin including many small delicate etches that need to be soldered into place and which appear to have built in wings that take flight,,,,, so beware
The great thing about Finney kits is that if formed correctly all etched parts fit with a high degree of precision and the castings whether white metal or lost wax are superb
.
Having completed an A4, A3 and V2 with a Duchess on the go you could say I'm a Finney fan
Incidentally my Finney A3 has a DJH highsided non corridor tender fitted with Spoked tender wheels while my DJH A3 with coal railed tender has disc wheels
So visual evidence of your chosen prototype is essential
Regards
Bob
ps This was 60051 before going off to the local Paintshops