Truncate Mulitple Words in a Cell

I have a text in multiple cells with varying lengths and number of words or numbers. I need to truncate each word, say to the first three characters, so the total lenght is no more than 25 characters. I am not sure how the TRIM, TRUN, LEFT, RIGHT or other defined functions might apply. A UDF might be best.

Examples
CONSTRUCTION SEQUENCING AND PHASING COMPOSITE PLAN
CON SEQ AND PHA COM PLA


ALIGNMENT HORIZONTAL CONTROL COMPOSITE PLAN
ALI HOR CON COM PLA


TEMPORARY ROADWAY NO. 4 ALIGNMENT DATA TABLES
TEM ROA NO. 4 ALI DAT TAB

Gives me a #NAME? error.

The UDF approach works. I must have messed up the insertion of the module originally. However, now that I think about it further, I would prefer to not use a function since in 2013 it needs to be an .xlsm extension and it needs to be distributed to a number of people. The COCATENATE approach also works, but I was hoping for a solution that was self contained in the cell. I will see if others come up with other ideas before closing this out. Thanks.

Thanks. I will play with this a bit and you are very correct in the length.