(Dengo) vocabulary but no grammar - risky?

Hmm... How risky is it to start creating vocabulary when you have no idea what a conlang's grammar will be? One of my New Year's resolutions was to resume work on Dengo, a language based on 5-letter words.

I still have no idea what kind of syntax Dengo will have. The leading candidates are Japanese-like, English-like, and Spanish-like.

I suppose it is possible to start gathering nouns, adjectives and verbs while having no idea what sort of particles and adpositions will be needed. And I am doing so. But I have a bad feeling about this.

By the way, as I'm assembling the vocabulary, I'm getting a strong urge to change voiceless consonants to their voiced counterparts. At this moment bidza sounds so much cooler than pitsa (= pizza).

mmmm... pizza.