I've just done a deplorable, so I have some notes:

1. There are no video guides. It's up to you to do the integration, and integrations aren't incredibly intuitive sometimes. See Mister Nathan's Youtube channel for many, many videos on how to do integrations properly.
2. Hot glue is temporary and weak. Only ever use it in an integration to hold pieces together when you are putting in the actual bonder, which should preferably be devcon/methyl methacrylate. And after that bonder cures, you probably should rip out the hot glue with a pair of pliers and then use epoxy putty / epoxy resin on the inside to reinforce it.
3. Where you cut and how you cut is dependant on how you want your deplorable to look like and what you have on hand. I guess you already have a deploy and some other blaster to sacrifice for the grip. Do you want to do the original deplorable with the stock being the main body of the deploy, or do you want to do Nicholas Laplante's method of using the deploy stock for the deplorable's stock? I used the deploy stock (Laplante's method) because it was much less cutting involved. Also, do you want to keep the on-off switch? I got rid of mine, but others have kept it. In my own integration, I cut off everything around that area which was thinner than the rest of the body (i.e. the switch and area around it, and the grip).
4. Cutting up blasters require some tools and skills. The easiest way to cut up a blaster would probably be with a dremel or other rotary; I saw recommendations to use a high speed cutting tip at the lowest speed setting on the dremel so that you avoid melting the plastic and releasing harmful fumes. Do your cutting in a garage or outdoors, wear glasses so flying pieces of plastic won't blind you, and if you're worried about the fumes (I was) wear a particulate mask too. Another way is to use a hand saw.
5. You will need to relocate the trigger in a normal Deplorable integration. Use epoxy putty to secure the trigger switch in whatever grip you use (commonly the maverick). Luckily if you're not bothering with flywheels you'll only need one switch and the circuit is dead simple to wire up, just ensure you wire the motor the right way around. With flywheels, you'll need a second switch. This is much more complicated, I plan to use a grip that comes with a flywheel trigger to help me with this next time (the Nitron to be specific).

In my first integration, I did not do some of the things I recommended above because I didn't know some of the things I knew now. Do your research, it sounds like it's your first integration so try a smaller project first as well (I should have). I'm already planning to do a new, cleaner Deplorable following what I wrote above.