my suggestion
a hanging cord side to side behind the picture secured to the sides and long enough to hold below the top surface
then 2x1mm holes in the grout lines with picture hook nails in the holes to hang the picture off with or without the hooks
probably better without the hooks as they...
in general never for 2 reasons lack off light in the building when off and because leds are perhaps 4-15w off no great amp value at perhaps 0.03-0.20 amps on a 6 amp lighting circuit perhaps 1% the value 230x6=1380w
to be fair the only recommendation is usually whats needed plus 50% for safety and that suggestion is what any man worth his salt will suggest which will be way over the top but safe
you can off course go the structural engineers route this will be possibly less heavy support but at greater...
100% agree with Diver Fred
actual tools depend on your requirements for example furniture manufacture may be chopsaw table saw and router
house renovation chopsaw sander jigsaw buzzy toy for example
no expert but the damage and the covering up all look at least 5-10 years old possibly much much more so no immediate danger but needs a proffesional opinion
do what i do pepper grinder/blood pressure monitor what ever with a motor at the first sign off struggle remove into the clock/remote control/door bell or whaever box for further service
can you not contact the local bus company i am sure there will be a retired old fitter you can contact via news letter or social club that will both know the answer and be delighted to help and give history and anecdotes
my thoughts
in general buses, trains and other passenger vehicles will need everything up to operational levels as in air pressure and control circuits live with a key in
most doors are pneumatic with electrical control and sensors??
are you suggesting your doors have no air pistons just...
my thoughts
a possible say 250w average over say 4 hours i 1kw so 1kw at cheap rate over normal rate saving perhaps 20p a day control gear costs perhaps £12 so could pay for its self quite quickly but if it goes wrong and your away for a few days 3 freezers full off food that needs to be eaten...
just space it off the concrete by around 12mm to keep the timber off the ground preferably at the top off the slope
you will need support along the joists [floor timbers]at least every 6-800mm dependent on timber size to avoid a trampoline
travis by default are overpriced i never use them you need a long relationship to get a decent discount with them you need a 60%+ discount to get the fair value
they work on the casual visitor being ecstatic with 25-40% discount