Nice idea and job you did on them!

For longer lengths you could use a bench disk sander, one with slots for a mitre fence not the other type obviously, one like this (https://www.axminster.co.uk/jet-jsg-...-sander-510390) but with-out the price tag of that unit lol.

I got mine on eBay for £40 second hand, paid for its self with-in a week, there such handy tools to have in the shop I couldn't be without mine now!