Adding To Plastic Question

How does one add plastic to existing plastic parts? I'm trying to modify one of my TFs into a forklift. (An idea I had before Scrapper came out in the video game). I need to know how to bond other parts I make (lift assembly and roll cage) with the existing toy. So far my leading kitbash candidate is Strongarm. Any better ideas as the starter 'bot for a beginner? I work at Home Depot and have a few ideas for the rest of our equipment/tools, but so far Packdown is the only one I can think to actually make that wouldn't be a horrendous wreck of a first time bash.

Scratch that, I'm taking Minicon Buzzsaw and making him into a mitre saw (Crosscut), but that doesn't really require too much physical modification, just some recoloring. Speaking of which, what colors would he look good in? Ryobi's blue and yellow? Black and Decker's black and orange? Dewalt's black and yellow? Any opinions welcome! :thumb