linkbuidling to subdomains ... will this work?

I would suggest to optimized your main page with all the 5 keywords, or if that's too long just choose the 3 main keywords. Then build your links with those keywords. You can use a niche-related blog comment, forum posting, or article marketing where you can put all of the keywords inside the article
 
Yes, that would work. But what you are talking about is a subdirectory and not a subdomain. Subdomain is toyota.cars. com. You can 301 those as well, though.
 
If I have a website with a general url and I have 5 important keywords ... would the following work?

Create empty subdomains www.url.com/keyword1/
redirect it to www.url.com
build links to www.url.com/keyword1/ for keyword1
Repeat this for the 5 keywords
First, those are subfolders not subdomains
http://keyword1.url.com - that is subdomain
Technically "www" in front of your url is a subdomain too)

Back to the question, redirecting subdomain? yes
But what you showed are subfolders which you dont redirect, you
interlink them.
 
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