Lets be fair - "toolbox" is about as bad as "swiss army knife". And Hull is not as good as other places for industrial skills and facilities, but let us rise above that.
You are trying to convey that the inhabitants are versatile.
Perhaps you might try to sell the city from another angle -
I am a Yorkie, and I like Hull. It is a fine city, and a pleasant place to live. I have lived in other cities, but there is no other large GB city where the people are as nice and generally honest, in my opinion. My experience of GB cities is limited to Edinburgh, Glasgow, Birmingham, Bradford, Leeds, London, Liverpool, Nottingham, Manchester, Reading and Leicester, but that is a wide and diverse selection compared to the places most people have lived in.
Hull does not deserve the reputation given by recent publications which described it as "the worst place in Britain to live".
Things I like about Hull -
There is no part of the city where you feel nervous, insecure, or vulnerable to attack. Even in the roughest places, you do not feel the need to hang on to your wallet or your cellphone.
The old part of Hull has stand-up bars and good food joints like those you find in London around Leicester Square and Coventry Street - but at prices you can afford! To a southern barfly, Hull is a really good place. Walk out of the city up Beverley Road, and you find there is more nightlife than you can absorb at one go - and since most of the target market are the local students, the prices are very affordable. Sunday lunch in the Welly Club can be a bit startling, because the place gets full of "late middle age" customers who you will not find participating in the Saturday night fun - you don't need to be young to recognise good value.
The place is not bereft of entertainment, etc. - there are events happening all the time in the city, and they are not hard to find. It is a treasurehouse for theatre goers, home to the Hull Truck Company, and there are night clubs, cinemas and bowling alleys, all those things you want to find in a large city. Two good RL teams and a soccer side worth following, state of the art stadium.
It is a cheap place to live. You can still buy a 2 bedroom terraced house for about £45k (it was probably flooded recently, but WTH if the electrics still work). You can buy things cheaply for your home - cheap furniture shops and cheap appliance shops abound. Shopping is generally good
You need a tradesman to fix something? Very few "muggers" about, you can find someone capable very easily, and they usually do not charge an arm and a leg - prices are fair. Plenty of good chances to find a plumber, electrician, builder, joiner or car mechanic that will do a good job without ripping you off.
In London, you're lucky to find someone that is not impersonating a tradesman.
You get cheap ferry trips to Belgium/Holland for "booze and baccy" - £65 for two people and a car is the usual cheap rate, and it is wise to take up the 10% discounted offer for dinner - otherwise, take things to make sandwiches to substitute for the onboard meals, be sure to use the cheap drinks vouchers in the booklet they give you when embarking - and you get a nice cabaret in the bar. It's a two day experience, but much more pleasant and convenient than travelling from Dover.
From Hull it is easy to get to genuine countryside, or the seaside - bored wife and kids at the weekend? Fling them in the car, 20 minutes on uncluttered roads and the kids are mucking about on the beach, while the wife is window shopping ... or just chuck them in the river and make them swim to Cleethorpes ...
Things I don't like about Hull -
The major drawback with Hull is that, to get broadband, you need to sign up for Kingston Communications cable service to get it at a sensible price.
KC telephone wires are thinner than BT lines, so you can't get broadband as easily as in the rest of the UK. And Hull is entirely wired for telephones with those thin KC cables.
And the schools are less than wonderful, but the local authority are taking a lot of positive action about that.
If I wanted to sell the place, I think I'd say "Hull - the city that lets you LIVE just as much as you want to ..." feel free to use the idea.