I don't see any problem with 150mb project files in today's era of terabyte drives. I deal with those in programs, video files and photoshop projects. I would not have a problem with even bigger files at the project source level which is what we are talking.

Programming deals with this since always. The source files are not a problem for size since there is only one. The executable files or in sound the performance file in wav or wma etc are the compiled files. That is where the files should be small and fast as possible. The size of the source is really of no concern. And certainly not today with the current drives and fast processors.