I would advise the company to adjust it’s integration timeline based upon the particular M&A. Longer time lines are needed when certain elements exist such a labor contracts, a company that is doing very well on it’s own, additional integration capital needs, etc… However, short time lines are needed when the company needs help now, or if the deal needs immediate value returned. So, look at the various scenarios and be prepared to adjust time lines as needed.
With regards to smaller companies supplying accurate records I would base the M&A agreement/terms sheet on specific performance criteria with specific remedies if there is inaccurate information supplied or if records are falsified. This is pretty standard but trickier than it seems!