I’m planning on revitalizing and bringing this old Itautec to the 21st century
I think it was born in the 21st century? From this it looks like the first Celeron M was in 2004, and the first at that clockspeed was 2005.
Also, 2GB of RAM is plenty for many purposes - that's more than any Raspberry Pi before the Pi 4 had!
The w700ds/w701ds ("Dual Screen")
... was not Lenovo's last try at putting two screens on a laptop; see also the X1 Fold and Yoga 9i