WPO8,
I think you need to specify exactly what you're looking for...streamlined OR smaller. Streamlined could be mean many things, up to and including removing certain parts to make it less 'cluttered'. Smaller basically means all the bells and whistles, cept smaller in size. It would also help to know if you're heading towards a Custom mando, or doing a movie version Mandalorian?
I'm 5'5" without armor and with standard movie sized armor and gauntlets [no modifications or resizing], this is me:
http://img.photobucket.com/albums/v7...Photo-0099.jpg
Hope this helps...
Stay safe,
Tim.