I've got a box full of structures to complete for a client in the next few weeks, and I've finished the first two. Both were very nice kits that were easy and enjoyable to put together.
The first is a British weighbridge hut by Ratio Plastic Models. Everything fit well with almost no fuss or bother. I spent almost 2 hours painting the less than one inch long shack with several different colors. A base coat for the stone walls and concrete for the lintels. Then some individual coloring of the stones to provide a non-patterned multi-chromatic wall. I used a brush with about 4 bristles for that. Then a white/cream wet wash for the mortar and some fun with black and earth for weathering and finally some touches of green moss growing around cracks and corners. The roof has a base dark green slate and heavy black weathering. The brass details for door and window were lightly weathered, but the gutters have standing blackish gunk in them.
The other structure is a laser cut wood icehouse from Branchline Trains. Fantastic kit with tight fits and no sanding and very little clean up of parts after picked out of the wood sheets. The 3M backed details is a brilliant idea - I was skeptical before assembling - but in N scale, it makes attaching the tiny items much easier. The only problem I had was with the ladders because the cut outs were so small, they kept scattering and sticking to everything. Minor annoyance for such a nice kit.
I weathered up the tar paper roof a bunch since it is so large and visible to try and give it the same level of detail as the scribed wood siding. I love how the decking turned out after I applied a little antique oak stain from Hallmark Home Decor (from the craft store in a 2 oz squeeze bottle). I scruffed up the wood siding and dry-brushed the siding and decks to bring out some detail and weather them up a bit.
It was almost a full day of work building the two - mainly because of the painting and making a quick run to the hobby shop for supplies.