I have not kept up with recent product offerings.
Normal snow shoes or skis may not be sufficient
for floatation in deep forest.

Areas of deeper powdery snow: 1)deep forest
protected from wind and sun 2) seldom used areas
where snow is not compacted.

Even with standard X country skis, you can be a$$
deep in snow. I have been deeper than that in virgin
snow. You would require extra long, wide skis, that
are still relativly light. So it is best to stay out of these
uncompacted snow areas, most of the time.

Other winter travelers beat down enough trails. Also
wind blown or open sun areas are usually OK.

You might consider making your own bindings: leather
half-shoes with straps, that fit around your boots.
(I saw commercial bindings like thase once, then never again.)

You can make your own skis as well. Look in books
on wood bending and steaming; you should be able to find
a specific project on skis.

Maybe finding slightly wide X-country skis and boots would be
best. You can make insulated overboots easier than you
can make bindings or skis.