I’ve looked at 007 cases, and even a rather battered one cost a bit, and you then need everything in order to build the complete watch, so I’m prepared to wait a bit and find one that isn’t silly money, and then it’s easier to mod it as an ongoing process.
If I get lucky with a reasonably priced 007, then I’d get the movement, face and hands and get the whole lot done in one go, then get the Tiger shroud fitted afterwards.
As you say, there’s a staggering range of bits out there for customising Seiko watches, not limitless, but certainly pretty huge.
And they’re good, reliable watches as well, not a shabby knock-off.
Sounds expensive. £100-£150 for a s/h SKX, a new movement and crown/stem to suit, different dial, hands and insert, sapphire glass and then £150 getting the case machined and you’re well into genuine Tuna money. The TST mod is great if you want an auto movement in a 300m style Tuna case which was why I bought a s/h TST’d 6309 case a few years ago, but even though mine was built with as many genuine parts as possible (SBBN007 dial, SKX hands and insert) I couldn’t get past it trying to be something it wasn’t so soon sold it at what would have been a 50% loss had I paid retail and bought the real thing in the shape of an SBBN015.
If you’re not bothered about the cost and just want to build something unique then by all means go for it as the options are virtually limitless. I have an SKX that owes me over £350 so I’m not averse to a Seiko mod but machining the case and fitting a Tuna style shroud is a mod too far imho.