firstly welcome to the forum , best wishes for your build.
The front frame is indeed a tricky little blighter, i know it took me two attempts.
i didn,t use the Armoto chassis pack & thought there was no further need to actually cut the parts that are supplied in that kit,
may i suggest ( to help you ) that you stop, until either the tuitorial sticky is re posted or if someone is close to you can show you how to do it.
it would help if you can put a rough location of where you are in your profile.
or maybe you can speak to someone who can guide you thru it via a telephone conversation, it is quite critical to get the front frame right as the whole top part of the chassis extends from it.
if i can help in any way then please just shout( ask)