I still have the majority of tools left over from my RV build so I am pretty much set regarding tools. So far I have only had to purchase a pneumatic rivet puller from Cleaveland Tool Company.... so far.
In addition to tools, I have purchased 3 large capacity plastic drawer units to hold the hardware parts. I did this on my RV build also but didn't really have enough drawers so ended up combining a lot of parts which proved problematic in the long run and I ended up wasting a lot of time locating parts during the build. This time I will make sure I have enough drawers for all the hardware parts.
I've also ordered a low cost small drafting table I plan to use for the OneX drawings. I didn't have a dedicated table for the RV build and the drawings got pretty shabby towards the end of the build.