I not only get pleasure out of watching trains go around and of operating a layout, I also increasingly get pleasure out of building a layout. While 3D printing is good for T scale, I've tried experimenting with scratchbuilding a couple of freelance buildings, largely in cardboard . Photos attached:
* A stone station building, fairly typical of a GWR branch line station. I made the card building and faced it with fine glass paper painted grey which I scored to try to get the effect of individual stones - which didn't do the craft knife any good! The roof is just painted card, scored to get a tile effect, but the tiles are much too big. The posters are made from small pieces of pages of magazines, carefully chosen to get a poster effect. Looking closely, they are not exactly 'square' nor all the same size but that doesn't seem too noticeable. The windows are also not 'square' and I tried several ways of getting the window pane effect. Most of them I just ended up using a paintbrush, and it shows, but one on the platform side I made from grey-painted paper on which I painted a white line between two pieces of masking tape. The platform awning also isn't 'square'. All this emphasises the importance of getting things exactly right in this scale.
* A thatched cottage. The card building is faced with ordinary white 80 gsm paper on which I drew the half timbering with a fine black texter pen. This time I tried to get the window frame effect by gluing on thin pieces of white paper, on some more successfully than others. The thatch is human hair obtained from my wife's hairdresser (having her get it for me avoided the need to explain the blonde hairs in the house!), carefully glued onto card. Initially I tried to glue the hair over the ridge but that didn't work well so I tried again by making each side of the roof separately, gluing on the hair and then gluing both sides of the roof onto the building. The top bit that goes over the ridge (don't know what it's called) is just painted paper; obviously I didn't get a perfect match with the hair colour. Even human hair is over-scale for T gauge, of course, but it's the overall effect that counts.
While up close and personal the flaws in the buildings are obvious, from the usual three feet away they don't look too bad. And even though from that distance some of the detail doesn't smack you in the eye, sub-consciously I think it affects how the buildings are viewed.