you have 2 options

1-model throw multi patch cuz sticking objects together won't help and free form fillet don't work always and very slow...

2-make a side,front,back if you can sketches and model them throw poly...if you can't model heads DON"T skip it try to learn modeling them there's alot of tuts on net its very importanat to know how to model them and believe me they are very cool when you know how to model them.



good luck