For me a build stalls for one of three reasons.
1. Design issue. Parts fit this-a-way and I want it that-a-way. Usually it goes into the box but not away. Stays on my desk forcing me to think about it.
2. Paint issues. Undecided color, too humid, in the purple pond, etc.
3. A genuine lack of interest in the subject. One of those "seemed like a good idea at the time" situations, to quote Steve McQueen. This situation is a no-go. The whole idea is scrapped and she'll either get parted out or redone some other way, later on.
Currently on hold
The rat is getting a major make-over.
Waiting on better painting weather.
Original Batmobile. Waiting on the guts to start it.
Project scrapped.
Paint weather soon.
*sigh*