I think you'll find that LPG bottle inside a cupboard is a total at risk practice in many ways.
It would be classed a permament fixture which then differs which rules apply.
It is on a flamable surface - ie the timber of the cupboard
It is in a confined space
Flexible hose to the stove has it's own regulations where it cannot enter from underneath the stove
as per Adrians one word . Starts aith a N and and nnds with an O
as a guide words from the local gas regulator in SA on just LPG heaters.
SAFETY ALERT
USING PORTABLE LPG CYLINDERS INSIDE WITH UNFLUED HEATERS
The use of LPG cylinders, indoors, to provide fuel for unflued
heaters is not recommended. The Australian Standard AS 5601
Installation, (referring to AS 1596) permits up to 12 litres (6
kilograms) of LPG to be stored inside residential premises.
However, the combination of LPG cylinder and unflued heater
together can create a dangerous situation. The user may
unknowingly breach the safety rules stated elsewhere in this issue,
as the appliance can be moved at will. The appliance may be used
in prohibited locations (bedroom, bathrooms), rooms that are too
small and which have no permanent ventilation installed.
Gas appliance retailers and installers are urged to
strongly discourage this practise and not to sell
components to facilitate it.
The storage and use of LPG cylinders indoors poses a
significant risk and should be avoided. The cylinder could tip
over and cause liquid supply to the burner, which will result
in flaring. Obviously, if the regulator was to vent or the
cylinder relief valve was to operate inside, the consequences
could be disastrous.