I've just dropped in on this thread and can't believe the number of 'specialist' and certainly pricey gadgets you have Cynric. I say gadgets, 'cos I'm not sure they quite fit the description of 'tool'... :scratch:
There are a number of these sorts of things out there for modelmakers; any of the chassis building jigs currently in circulation seem to fall into this category. The sorts of device where the solution drives the problem; rather than the other way around. 'I've got a lovely new toy, now; what can I use it for' rather than 'I have a problem I need to solve'. I'm all for having a solutions-awaiting-a-problem box, but this habit is costing you.
I went the other route; buying decent, usually British made, hand tools. So I do use Vallorbe files, Eclipse piercing saw frame and marking out tools, Spear squares and larger files, Mitutoyo or Moore and Wright measuring tools, a small surface plate and scribing block, etc, etc. I find this much more helpful than buying a range of (expensive) tools all designed to fullfill only one purpose. A largeish sheet of 1/2" plate glass sitting on a heavy MDF board with a layer of accurately drafted graph paper between the two makes a terrific all purpose jig for assembling models (of infinite variety) square and/or flat. As an example you can add a set of Meteor jig axles and some 9" lengths of 3/16" silver steel and it's a damned good loco chassis jig too...
Steph (bad day at work, GW rivet press, Leakey rolling bars, 3" benchvise, Skoda lathe about 150miles away, realises when he's gone off on one, reasonable sense of ridiculous normally, normal service will be resumed shortly, deep breath, count to ten, wait for the beep/bang, etc ...:-[... )