Re: Just use modules?
Yes, but the "code snippets" would have to be made by someone with PHP coding ability, which I imagine you'd have to pay for.
An alternative would be emulating your current site design in Tiki. Again this might be something you'd have to pay for, but probably considerably less and it might be a more seamless arrangement, and I can suggest someone who could do it 
.
-- Gary - zukakakina.com / themes.tikiwiki.org
;){kind=link}
;){kind=link}