Hi William,
Thank you for the comment.You may be being too hard on yourself.It really all depends on what you want to accomplish with a dio.Many modelers are very picky about the acuracey of their subject and I totally admire them for that.Personally I do it all just for the enjoyment.I try to keep things as acurate as I can to what my knowledge will let me,but there are a lot of other members out there that certainly are better informed.I always say"who's your audience".If you plan to enter into a competion the details are much more important.If ,like me,it's mainly family and friends that see my work they enjoy it.None of them are going to say that machine gun or fuel can isn't right.
If you have choosen this for a hobby,make it a hobby for relaxation and try to keep as stress free as possible.