Where can I find hinges, spikes, locks and other upgrade material?

These items you can get from the boat at certain levels:

Hinges - level 20
Spike - level 20
Lock - level 20
Door Handle - level 20
Golden Hinges - level 40
Golden Spike - level 40
Golden Lock - level 40
Golden Door Handle - level 40
Golden Lamp - level 40
Wall Lamp - level 40
Dwarven Hinges - level 60
Dwarven Spike - level 60
Dwarven Lock - level 60
Varnish - level 60