Hello 
Before releasing anything, I need to finish my own ResHacker's replacement. It's progressing slowly, however, mainly because programming is a hobby for me and... I'm very perfectionist. I can't release it until it's almost perfect.
Current BricoPacks generator is a piece of crap, it won't be of much help to you. I can however tell you how it works, so you can implement your own NSIS script, it's rather easy.