grammaticality - For + verb-ing at the beginning of a sentece

Is the following sentence structure grammatically correct? I mean, I've found a lot of examples that have this structure but not at the beginning of the phrase but with a subject before. Here is an example I'm trying:

For designing the 3D model of a new tool it's necessary to be sure...

UPDATE: This is the research I've done:

For + verb-ing: the purpose of an object
However, if we are talking about the purpose of an object or an action, we normally use the for + verb-ing pattern. Note that this pattern commonly answers the question: What are they (used) for? Compare the following:

Schools are for educating children not for entertaining them.
Schools are for learning. Life is for living.
This kitchen knife is especially useful for slicing vegetables.
What's this for? ~ It's for opening oysters. It's much better than a knife.
What's this fifty pound note for? ~ It's for buying food for the weekend.

Note that when the subject of the sentence is a person rather than the thing described, the to + infinitive pattern is also possible:

I use this small knife to slice vegetables with.
I use this gadget to open shellfish with.

As it is explained it can be used with a subject before, but I haven't been able to find anywhere something explaining the case when For + verb-ing is at the beginning of a sentence

Answer

There are sentences that start with "for verbing" but that one isn't a particularly good one:

For eating right away, I prefer Macintosh apples.

For fitting into a small space, the Smart Car is terrific.

For educating children, schools are the usual solution.

So if your question is "can I do this?" the answer is yes. If your question is something else ("What is this called?" "Is there generally a better way to word these sentences?" "Is my particular example grammatical?") then I suggest you edit the question to include an actual question.