newbie question

[smartcat]

Hi guys,

I have no experience in this stuff, have only built some easy planes so far; I am greatly enjoying and admiring the amazing builds and conversions posted on this site.

I am trying to learn about converting trucks and excavators etc to RC (since I cannot afford Wedico ). For starters, can any of these be converted?

http://www.outbacktoystore.com/1-16t...-1-32nd-scales

There is a lot more in that shop.

Is it possible to tell from pictures and size if something can be converted (without first buying it)?

Thanks a lot in advance. Hoping to someday post a build here myself