I made a response before this, thinking that this was my newer version of the pelican, which is vanilla. I realised that this was the older version, which does use Sage's industrial thruster mod and the sloped armour thruster mods, both of which can be replaced with vanilla blocks. As I said in my other comment, there is a (in my opinion) better version of the pelican that I have made.
Hope this helps :)

Also I made a more up to date version of this, which is also vanilla. Please have a look at that. It works in atmosphere too. http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=732157268

Why do I get a message saying, ''This ship contains special blocks not aviable in this world?

I'm looking forward to it.

Hoping to make some planetary Halo vehicles soon! Including a new pelican model.

Planning on doing an update on this, and a second version, with hydrpgen thrusters if possible. I hope to make this fully planet compatible, and more stable!

Thanks! I'll definately have to update it. Improve all the naming and grouping stuff. Never liked doing that :D

I love the hard work you put into this!