Conflict Alert I reckon you'll need to increase those costs a little (double in some cases)
Insurance - Normally percentage of hull value, Super Cub is xpensive, I don't think you will get much change from 90 - 100K for a good one, and around 5% = $5000/100 = $50hr Insurance
Fuel & Oil- Super Cub has O320 150-160HP around 35/36 Litres Hour, with fine pitch prop on it to get in and out of tight places, the engine will be revving higher than normal with this combination, lower TAS in cruise, longer time to get to and from said tight places = higher than normal fuel flow overall. Say 40 LHR x 100 = 4000L x $2L = $8000 year /100 = $80hr fuel.
Oil @ 1L/5hrs = 20yr @ $10L = $200/100 = $2hr (actual oil cost will probably be more depending on engine condition)
Maintenance - Would have to be at least $1800 -2000 for 100 Hourly @ one per year, plus ARA, would say about the same = $4000/100 = $40hr. Contribution for new engine and prop, recover, tyres, unscheduled R&M would depend engine life, fabric condition etc. 40K for new engine and prop alone - 40000/15 (15 years @ 100hrs year) = $2670 year/ 100 = $26.7hr say $30hr
Basic operating cost therefore is $202hr @ 100hrs year without hangarage, finance, increase insurance for low time pilots, airways and landing fees. Plus I would put in 20-30% overall for the 'wife and kids' factor!
All this in NZD by the way.
Would love to have me own machine and hence have crunched a few numbers and, yep, in 'aint cheap!