Here is a link to a very useful website.
There are links to a PDF step by step guide & the parts list with pictures is a good starting point..
The only Upgrades I would suggest is to replace the Push Pull Steering with a Solid Steering Rod. And for convenience make the Rig Removable..
There are a variety of options on how to build but I suggest the first one follow the Kit Instructions..
Cheers & ask as many questions as needed..