Downlights in lathe and mortar (replacing ceiling)

[GStueyXR]

I recently done a job fitting downlight in lathe and mortar. I pre-warned the customer of the perils of doing this and the possible damage.

Anyway, cut a long story short, the holes I drilled have since cracked along the lathes and the customer has rang me to ask if I would carry out remedials... No problem, I want her to be happy. So, I have offered to put in a new cladded ceiling and refit downlights for half my normal daily rate. She is pleased with this...

Just need clarification of the best approach to this:

The job is an upstairs bathroom, I want to knock out all the old lathe and use existing joists to batten and fit cladding to. Is there a better approach to this ? Cladding is MDF.

 

[blackiel]

Be careful son,ive worked in asbestos infected area for years,seen a couple of geezers peg outick it catches you,when youre older and weaker,board over,least disturbance....the better