Ive used catia v5 in the past. where you can zoom all the way in and thought side wall etc. and continue modelling inside of a box or cylindrical shape or assembly.
why is this not possible with solidworks? i know of the walk through feature which has the closest effect, but they should just make it part of the zoom somehow so you can continue modeling. would be so much easier.
And don't get me started on the coloring of objects. We have an old cad package called ideas and with that each time you create a new body it automatically colours it in a contrasting colour to the bodies next to it. id love solidworks to add in these options.