So I've just recently acquired (for a fantastic bargain) a couple of MR locomotive kits which I'm aware have something of a reputation... the old Ratio plastic 2-4-0 and 4-4-0. While the 2-4-0 is the original version with the horrid mazak wheels and cheap motor, the 4-4-0 is thankfully the later release with a brass chassis by Perseverance. Of course, this means that it does not come with the wheels/mechanism. Looking at the accompanying weight diagram for the 1312 class (I believe that's what the Ratio 4-4-0 represents?) in Essery v.2, the dimensions of the bogie wheels are hard to make out; it looks like 3' 3 1/2" dia. to me, but would appreciate confirmation. I know the drivers are 6' 6" on both kits (correct for the 4-4-0, incorrect for the 2-4-0, but the kits are designed the same way so 2 and a half inches will just have to be excused!). Currently I'm looking at potentially using Scalelink wheels, but wonder if Romford/Markits or Gibson have more accurate ones?
In regards to the 2-4-0, I do know that the Gibson catalog lists milled frames that fit the kit. Last I heard, they were having some issues with supplying frames; does anyone know if those have been resolved?
An additional point of interest is the tender wheels; the kit ones are 3' 6" whereas the prototype are 4' 3"... that's a whole 9 inches missing. The tender body itself doesn't seem too bad (the 4-4-0 kit comes with a nice replacement etch for the coal rails) and could probably be used with some detail improvements if the chassis were amended. Maybe the internal chassis unit by Comet would be a good fit?
I know some have opted to stick a drive unit in the tender, pack the loco body with weight, and dwell no more on the issue, but I would like to avoid that if possible; to me it seems like the cheap and easy way out. Any tried and true gearbox/motor/weight combinations?
Will certainly appreciate any guidance. I don't expect to make masterpieces out of these things, but if I can achieve a well-running result I'll be more than satisfied. Easier than a London Road kit at my skill level, at least!