I think that would be a good solution in the circumstances. A “square box” with a hinged door would suffice, and perhaps some of the ladies could attach eyelet screws and cord to hang silk ‘drapes’ to line it with, a (purificator ← is wrong - my mistake, sorry. It should be a corporal) on the floor is suitable for the ciboriums to be placed on, and a simple white silk or satin covering for a veil - would do for this year. Hopefully by next year, if after each Mass a collection is taken up to raise money or other fundraisers happen, enough can be saved to buy a second hand tabernacle.