"With still a lot of work to do in!" ---- what kind of sentence is that?
I think in this case "inside" would be a better translation
As far as I know, the word 'travail' with the meaning of 'work' does not have a plural form, rather, it should be seen as an uncountable noun. Its plural form 'travaux' has nothing to do with 'work' and only refers to 'construction'.