The railway stuff takes priority at the moment.
I know exactly what you mean. I currently have three O gauge locos bunging up my bench. I try to get a lot of work done on them, then treat myself to some styrene wrangling. I fear the Blenheim will linger in the stash for some time to come.
I currently have a Hornby 42xx on the workbench that needed some styrene wrangling - I managed to lose a sandbox while modifying the chassis.
Then there's this little lot to do..
An old Mainline Manor to rename and weather.
5 Collett coaches (4 Hornby, 1 Mainline) to modify (add destination board brackets, closer coupling on Mainline one), repaint roofs (post war GW) & weather.
A Castle to update to post war G&W livery & rename (weathered, but ex-works)
4 More Hornby Colletts to modify (remove close coupling mechanisms and fit Romford Screwlinks & corridor connectors) & weather.
Another Castle and a Bachmann 93xx to modify, etc...
And 5 Bachmann Mk.1's to weather.
Oh I forgot, a Manor to build using a Comet Chassis and Bachmann Parts (tender & loco body) at some point.
So I might get back to kits eventually!