I don't think the Doyusha kit's that bad...
Unless you've already got one, your biggest problem is going to be finding, or affording the Monogram DB4. I've been looking for several years, since first seeing Simon's build under way, and I've never found one I was prepared to pay the going rate for. I'm hoping for a charity shop windfall (like the original Airfix James Bond DB5 I picked up for £6) because the DB4 is going up and up. Maybe we'll get lucky and it'll be reissued, or, just maybe, someone will hear my plea and tool up a new one in 1/24 which can then be boxed and released as a DB4, DB Convertible, DB4GT and DB4GT Zagato forms with different body shells!
bestest,
M.