Mixing perry with victrix ? Absolute not. They don't match, and after a while you will be terrible disappointed. Victrix bayonets break off !!
Use you perry boxes (buy 4 boxes of inf) a blitz of extra officers, and father a while you will need some extra perry blitz (flank inf). Perry plastic is very solid, victrix is NOT. Use Perry Dragoons, Cuirrassiers (&Carabiniers) and some hussars for your basic horses.
You have to understand, that you are very lucky you can make a french army (and not a British), because in Napoleonic you will always need French, and only exceptional British.
The guy who is writing this, has already 6.000 units of 28mm Napoleonic, mainly foundry & perry (French (several brigades regular & guard), Italian, Westphalian, Bavarian, Austrian, Brunwick, KGL's, ... and working very soon on Russians)
I made a victrix Old guard chasseurs & grenadiers, but there were crap, so i sold them. Everything of plastic broke off, terrible !
If you need some help in building up. Sometime i sell some painted units (very soon some French Guard 3e Grenadiers the well known Dutch guard).
It can be interesting to buy some well painted units to have some examples what result you can make. And please remember you need painting quantity and not 100+ quality. It is the amount of painted units on the table that count.
Greating from Flanders (30km from Ypres)